stuartiannaylor

Raspberry Pi 3 Zram optimisation

Mon Dec 05, 2016 4:02 pm

I copied the zram config and settings from https://gist.github.com/sultanqasim/797 ... 8008dfa374

Code: Select all

#!/bin/bash

# Raspberry Pi ZRAM script
# Tuned for quad core, 1 GB RAM models
# put me in /etc/init.d/zram.sh and make me executable
# then run "sudo update-rc.d zram.sh defaults"

modprobe zram
echo 3 >/sys/devices/virtual/block/zram0/max_comp_streams
echo lz4 >/sys/devices/virtual/block/zram0/comp_algorithm
echo 268435456 >/sys/devices/virtual/block/zram0/mem_limit
echo 536870912 >/sys/devices/virtual/block/zram0/disksize
mkswap /dev/zram0
swapon -p 0 /dev/zram0
sysctl vm.swappiness=70
I must admit rather impressed with Zram and have to say I am perplexed by the 100mb file swap provided by Raspberian. If swap on SD = Bad then why a 100mb file based one. Also can partitions fail on a SD and still allow other partitions run? Or because of the serial nature its 'Game over' as a partition at the end of the disk from a noob perspective makes much more sense.

Anyway I did a little bit of a test with Zram and just loaded web pages into chromium. Some of these are pretty heavy like logged onto Outlook.com (god knows what it does), Facebook, Youtube playing a stream of music videos, twitter,bbc, guardian, independent, github, wikipedia, the independent.
When you start to get to 9 pages things start to get heavy until the page loads 12 or 13 in tabs then as you will see in the little info output I created Zram works perfect but when it approaches nearly full then things start to slow considerably.

If you want to test it yourself and have some comparisons here is my little bit of a script.

Code: Select all

echo "****************************************************************" >> info
echo "****************************************************************" >> info
echo "Tab $1 /procs/swaps" >> info
cat /proc/swaps >> info
echo "*********************" >> info
echo "Tab $1 /procs/meminfo" >> info
cat /proc/meminfo >> info
echo "***********" >> info
echo "Tab $1 free" >> info
free -m >> info
echo "*************" >> info
echo "tab $1 vmstat" >> info
vmstat >> info
echo >> info
echo >> info
Here is the output waiting for each tab to settle and load then running sh info.sh
Here is my results and as you can see the above Zram script is working wonderfully and seems to be extremely well optimised.

Code: Select all

****************************************************************
****************************************************************
Tab 1 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	0	-1
/dev/zram0                              partition	524284	0	0
*********************
Tab 1 /procs/meminfo
MemTotal:         882772 kB
MemFree:          228504 kB
MemAvailable:     576088 kB
Buffers:           47408 kB
Cached:           378432 kB
SwapCached:            0 kB
Active:           385092 kB
Inactive:         223296 kB
Active(anon):     183168 kB
Inactive(anon):    43644 kB
Active(file):     201924 kB
Inactive(file):   179652 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:         626680 kB
Dirty:                80 kB
Writeback:             0 kB
AnonPages:        182568 kB
Mapped:           194340 kB
Shmem:             44244 kB
Slab:              25440 kB
SReclaimable:      13932 kB
SUnreclaim:        11508 kB
KernelStack:        2144 kB
PageTables:         5184 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    1508928 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 1 free
             total       used       free     shared    buffers     cached
Mem:           862        638        223         43         46        369
-/+ buffers/cache:        223        639
Swap:          611          0        611
*************
tab 1 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0      0 228392  47408 378432    0    0    37    14  227  130  2  0 94  3  0


****************************************************************
****************************************************************
Tab 2 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	0	-1
/dev/zram0                              partition	524284	0	0
*********************
Tab 2 /procs/meminfo
MemTotal:         882772 kB
MemFree:          186408 kB
MemAvailable:     537384 kB
Buffers:           47480 kB
Cached:           388268 kB
SwapCached:            0 kB
Active:           416576 kB
Inactive:         232800 kB
Active(anon):     214228 kB
Inactive(anon):    50248 kB
Active(file):     202348 kB
Inactive(file):   182552 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:         626680 kB
Dirty:               436 kB
Writeback:             0 kB
AnonPages:        213628 kB
Mapped:           202796 kB
Shmem:             50848 kB
Slab:              25656 kB
SReclaimable:      14072 kB
SUnreclaim:        11584 kB
KernelStack:        2232 kB
PageTables:         5828 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    1656596 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 2 free
             total       used       free     shared    buffers     cached
Mem:           862        680        182         49         46        379
-/+ buffers/cache:        254        607
Swap:          611          0        611
*************
tab 2 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0      0 186408  47480 388268    0    0    37    14  228  132  3  0 93  4  0


****************************************************************
****************************************************************
Tab 3 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	0	-1
/dev/zram0                              partition	524284	0	0
*********************
Tab 3 /procs/meminfo
MemTotal:         882772 kB
MemFree:           97988 kB
MemAvailable:     476096 kB
Buffers:           47732 kB
Cached:           422400 kB
SwapCached:            0 kB
Active:           475792 kB
Inactive:         261284 kB
Active(anon):     267536 kB
Inactive(anon):    57612 kB
Active(file):     208256 kB
Inactive(file):   203672 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:         626680 kB
Dirty:                 4 kB
Writeback:             0 kB
AnonPages:        266952 kB
Mapped:           210388 kB
Shmem:             58212 kB
Slab:              25892 kB
SReclaimable:      14276 kB
SUnreclaim:        11616 kB
KernelStack:        2320 kB
PageTables:         6620 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    1901576 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 3 free
             total       used       free     shared    buffers     cached
Mem:           862        766         95         56         46        412
-/+ buffers/cache:        307        554
Swap:          611          0        611
*************
tab 3 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0      0  97840  47732 422400    0    0    38    14  229  134  3  0 93  4  0


****************************************************************
****************************************************************
Tab 4 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	0	-1
/dev/zram0                              partition	524284	0	0
*********************
Tab 4 /procs/meminfo
MemTotal:         882772 kB
MemFree:           62068 kB
MemAvailable:     440468 kB
Buffers:           47816 kB
Cached:           431356 kB
SwapCached:            0 kB
Active:           507940 kB
Inactive:         264016 kB
Active(anon):     293376 kB
Inactive(anon):    66332 kB
Active(file):     214564 kB
Inactive(file):   197684 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:         626680 kB
Dirty:                20 kB
Writeback:             0 kB
AnonPages:        292776 kB
Mapped:           220272 kB
Shmem:             66932 kB
Slab:              25964 kB
SReclaimable:      14220 kB
SUnreclaim:        11744 kB
KernelStack:        2408 kB
PageTables:         7268 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    2060328 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 4 free
             total       used       free     shared    buffers     cached
Mem:           862        801         60         65         46        421
-/+ buffers/cache:        333        528
Swap:          611          0        611
*************
tab 4 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0      0  61748  47816 431356    0    0    38    14  230  136  3  1 93  4  0


****************************************************************
****************************************************************
Tab 5 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	0	-1
/dev/zram0                              partition	524284	4784	0
*********************
Tab 5 /procs/meminfo
MemTotal:         882772 kB
MemFree:           32140 kB
MemAvailable:     381172 kB
Buffers:           47500 kB
Cached:           409016 kB
SwapCached:            0 kB
Active:           500352 kB
Inactive:         299548 kB
Active(anon):     308388 kB
Inactive(anon):   108884 kB
Active(file):     191964 kB
Inactive(file):   190664 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:         621896 kB
Dirty:              2144 kB
Writeback:             0 kB
AnonPages:        343280 kB
Mapped:           232768 kB
Shmem:             73996 kB
Slab:              26632 kB
SReclaimable:      14724 kB
SUnreclaim:        11908 kB
KernelStack:        2480 kB
PageTables:         8036 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    2257416 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 5 free
             total       used       free     shared    buffers     cached
Mem:           862        830         31         72         46        399
-/+ buffers/cache:        384        477
Swap:          611          4        607
*************
tab 5 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0   4784  32224  47500 409016    0    0    37    14  231  138  3  1 93  4  0


****************************************************************
****************************************************************
Tab 6 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	0	-1
/dev/zram0                              partition	524284	4968	0
*********************
Tab 6 /procs/meminfo
MemTotal:         882772 kB
MemFree:           38780 kB
MemAvailable:     304264 kB
Buffers:           47868 kB
Cached:           345820 kB
SwapCached:            0 kB
Active:           459344 kB
Inactive:         333160 kB
Active(anon):     303744 kB
Inactive(anon):   189672 kB
Active(file):     155600 kB
Inactive(file):   143488 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:         621712 kB
Dirty:              8456 kB
Writeback:             0 kB
AnonPages:        398884 kB
Mapped:           253876 kB
Shmem:             94608 kB
Slab:              26604 kB
SReclaimable:      14712 kB
SUnreclaim:        11892 kB
KernelStack:        2568 kB
PageTables:         8836 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    2494292 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 6 free
             total       used       free     shared    buffers     cached
Mem:           862        824         37         92         46        337
-/+ buffers/cache:        439        422
Swap:          611          4        607
*************
tab 6 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 2  0   4968  38592  47868 345820    0    0    37    14  233  141  3  1 92  4  0


****************************************************************
****************************************************************
Tab 7 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	0	-1
/dev/zram0                              partition	524284	24976	0
*********************
Tab 7 /procs/meminfo
MemTotal:         882772 kB
MemFree:           49172 kB
MemAvailable:     192788 kB
Buffers:            1944 kB
Cached:           268884 kB
SwapCached:          204 kB
Active:           412288 kB
Inactive:         363072 kB
Active(anon):     321340 kB
Inactive(anon):   276040 kB
Active(file):      90948 kB
Inactive(file):    87032 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:         601704 kB
Dirty:              2416 kB
Writeback:             0 kB
AnonPages:        504400 kB
Mapped:           230216 kB
Shmem:             92848 kB
Slab:              25172 kB
SReclaimable:      13188 kB
SUnreclaim:        11984 kB
KernelStack:        2784 kB
PageTables:        10400 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    2952076 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 7 free
             total       used       free     shared    buffers     cached
Mem:           862        814         48         90          1        262
-/+ buffers/cache:        549        312
Swap:          611         24        587
*************
tab 7 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 2  0  24976  49172   1948 268880    0    2    35    17  272  205  4  1 91  5  0


****************************************************************
****************************************************************
Tab 8 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	0	-1
/dev/zram0                              partition	524284	240624	0
*********************
Tab 8 /procs/meminfo
MemTotal:         882772 kB
MemFree:           47836 kB
MemAvailable:      92908 kB
Buffers:            1524 kB
Cached:           210312 kB
SwapCached:         2636 kB
Active:           302556 kB
Inactive:         374404 kB
Active(anon):     275784 kB
Inactive(anon):   320572 kB
Active(file):      26772 kB
Inactive(file):    53832 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:         386056 kB
Dirty:                 0 kB
Writeback:            64 kB
AnonPages:        464860 kB
Mapped:           190512 kB
Shmem:            131140 kB
Slab:              23236 kB
SReclaimable:      10852 kB
SUnreclaim:        12384 kB
KernelStack:        2848 kB
PageTables:        11284 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    3337872 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 8 free
             total       used       free     shared    buffers     cached
Mem:           862        815         46        128          1        205
-/+ buffers/cache:        608        253
Swap:          611        234        377
*************
tab 8 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0 240624  47372   1816 210464    0   19    42    18  368  386  4  1 88  6  0


****************************************************************
****************************************************************
Tab 9 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	0	-1
/dev/zram0                              partition	524284	383132	0
*********************
Tab 9 /procs/meminfo
MemTotal:         882772 kB
MemFree:           38096 kB
MemAvailable:     141384 kB
Buffers:            6588 kB
Cached:           212592 kB
SwapCached:         7396 kB
Active:           328640 kB
Inactive:         299156 kB
Active(anon):     251844 kB
Inactive(anon):   237288 kB
Active(file):      76796 kB
Inactive(file):    61868 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:         243548 kB
Dirty:                 0 kB
Writeback:             8 kB
AnonPages:        402312 kB
Mapped:           148272 kB
Shmem:             80232 kB
Slab:              23964 kB
SReclaimable:      11168 kB
SUnreclaim:        12796 kB
KernelStack:        2784 kB
PageTables:        11612 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    3481016 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 9 free
             total       used       free     shared    buffers     cached
Mem:           862        825         37         78          6        207
-/+ buffers/cache:        610        251
Swap:          611        374        237
*************
tab 9 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0 383132  37684   6588 212740    5   26    37    19  639  911  6  1 86  7  0


****************************************************************
****************************************************************
Tab 10 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	0	-1
/dev/zram0                              partition	524284	410772	0
*********************
Tab 10 /procs/meminfo
MemTotal:         882772 kB
MemFree:           40220 kB
MemAvailable:      84376 kB
Buffers:            1336 kB
Cached:           146260 kB
SwapCached:         3736 kB
Active:           318552 kB
Inactive:         300932 kB
Active(anon):     269880 kB
Inactive(anon):   269760 kB
Active(file):      48672 kB
Inactive(file):    31172 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:         215908 kB
Dirty:               236 kB
Writeback:             0 kB
AnonPages:        468272 kB
Mapped:           140112 kB
Shmem:             67816 kB
Slab:              23412 kB
SReclaimable:      10544 kB
SUnreclaim:        12868 kB
KernelStack:        2800 kB
PageTables:        11892 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    3576252 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 10 free
             total       used       free     shared    buffers     cached
Mem:           862        823         38         66          1        142
-/+ buffers/cache:        678        183
Swap:          611        401        210
*************
tab 10 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0 410772  39612   1356 146388    6   29    39    19  662  950  6  2 85  7  0


****************************************************************
****************************************************************
Tab 11 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	69408	-1
/dev/zram0                              partition	524284	483252	0
*********************
Tab 11 /procs/meminfo
MemTotal:         882772 kB
MemFree:           34896 kB
MemAvailable:      83612 kB
Buffers:            1020 kB
Cached:           175488 kB
SwapCached:        20760 kB
Active:           297088 kB
Inactive:         291876 kB
Active(anon):     247620 kB
Inactive(anon):   256912 kB
Active(file):      49468 kB
Inactive(file):    34964 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:          74020 kB
Dirty:              2320 kB
Writeback:             4 kB
AnonPages:        392116 kB
Mapped:           160808 kB
Shmem:             92048 kB
Slab:              23572 kB
SReclaimable:      10488 kB
SUnreclaim:        13084 kB
KernelStack:        2848 kB
PageTables:        12236 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    3721032 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 11 free
             total       used       free     shared    buffers     cached
Mem:           862        828         34         89          1        171
-/+ buffers/cache:        655        206
Swap:          611        539         72
*************
tab 11 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0 552660  34724   1040 175616   11   41    43    24  677  976  7  2 84  8  0


****************************************************************
****************************************************************
Tab 12 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	79028	-1
/dev/zram0                              partition	524284	518712	0
*********************
Tab 12 /procs/meminfo
MemTotal:         882772 kB
MemFree:           43980 kB
MemAvailable:      88976 kB
Buffers:            1524 kB
Cached:           170856 kB
SwapCached:         7900 kB
Active:           282844 kB
Inactive:         279252 kB
Active(anon):     230864 kB
Inactive(anon):   250452 kB
Active(file):      51980 kB
Inactive(file):    28800 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:          28940 kB
Dirty:               128 kB
Writeback:             0 kB
AnonPages:        382592 kB
Mapped:           159252 kB
Shmem:             91584 kB
Slab:              23468 kB
SReclaimable:      10352 kB
SUnreclaim:        13116 kB
KernelStack:        2840 kB
PageTables:        12260 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    3718588 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 12 free
             total       used       free     shared    buffers     cached
Mem:           862        819         42         89          1        167
-/+ buffers/cache:        650        211
Swap:          611        583         28
*************
tab 12 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0 597696  43576   1544 171112   14   46    45    25  700 1015  7  2 83  8  0


****************************************************************
****************************************************************
Tab 13 /procs/swaps
Filename				Type		Size	Used	Priority
/var/swap                               file		102396	102384	-1
/dev/zram0                              partition	524284	524268	0
*********************
Tab 13 /procs/meminfo
MemTotal:         882772 kB
MemFree:           37236 kB
MemAvailable:      62760 kB
Buffers:            1212 kB
Cached:           128836 kB
SwapCached:        20592 kB
Active:           290876 kB
Inactive:         271320 kB
Active(anon):     248668 kB
Inactive(anon):   252192 kB
Active(file):      42208 kB
Inactive(file):    19128 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        626680 kB
SwapFree:             84 kB
Dirty:              1100 kB
Writeback:             0 kB
AnonPages:        412340 kB
Mapped:           115124 kB
Shmem:             68544 kB
Slab:              23476 kB
SReclaimable:      10296 kB
SUnreclaim:        13180 kB
KernelStack:        2840 kB
PageTables:        12412 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1068064 kB
Committed_AS:    3761080 kB
VmallocTotal:    1179648 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
CmaTotal:           8192 kB
CmaFree:            3720 kB
***********
Tab 13 free
             total       used       free     shared    buffers     cached
Mem:           862        825         36         66          1        124
-/+ buffers/cache:        698        163
Swap:          611        611          0
*************
tab 13 vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  4 626656  40348   1188 126272   18   50    49    26  716 1041  7  2 82 10  0



e-raser
Posts: 71
Joined: Sat Apr 04, 2015 1:30 pm

Re: Raspberry Pi 3 Zram optimisation

Fri Mar 22, 2019 11:55 pm

When "sudo update-rc.d zram.sh defaults" I get:

Code: Select all

insserv: warning: script 'zram.sh' missing LSB tags and overrides
insserv: There is a loop between service watchdog and zram.sh if stopped
insserv:  loop involving service zram.sh at depth 2
insserv:  loop involving service watchdog at depth 1
insserv: Stopping zram.sh depends on watchdog and therefore on system facility `$all' which can not be true!
insserv: exiting now without changing boot order!
update-rc.d: error: insserv rejected the script header
So... what now?
1x Nextcloud & Pi-hole & ... on Raspbian @ Pi (4 4 GB)
1x Kodi media center on LibreELEC @ Pi 3 B+

stuartiannaylor

Re: Raspberry Pi 3 Zram optimisation

Sat Mar 23, 2019 12:01 am

https://github.com/StuartIanNaylor/zram-swap-config

Done quite a bit with zram since then and much of what is zram-config-0.5 is for most parts broken.
Try the above.

Also gone zram crazy and if block write wear is a factor then try
https://github.com/StuartIanNaylor/log2zram

https://github.com/StuartIanNaylor/zramdrive

As for the above to be honest had totally forgot about the post but prob something due to raspbian now using systemd

cjan
Posts: 749
Joined: Sun May 06, 2012 12:00 am

Re: Raspberry Pi 3 Zram optimisation

Sat Mar 23, 2019 8:09 am

try zram-swap-config, R/W still all the time after boot.
which cause? does log2zram must needed?

e-raser
Posts: 71
Joined: Sat Apr 04, 2015 1:30 pm

Re: Raspberry Pi 3 Zram optimisation

Sat Mar 23, 2019 11:39 am

zram-swap-config works good. Basic issue are RAM related, mostly OOM_REAPER killing processes. Didn’t happen a few weals ago, happened almost silently. Unfortunately zram helps a bit (it increases the timespan until OOM_REAPER kicks in) but the basic issue remains :-((((((((
1x Nextcloud & Pi-hole & ... on Raspbian @ Pi (4 4 GB)
1x Kodi media center on LibreELEC @ Pi 3 B+

stuartiannaylor

Re: Raspberry Pi 3 Zram optimisation

Sat Mar 23, 2019 2:14 pm

Sounds like you have a memory leak somewhere with something you are running and like you say zram just extends availability.

Not the easiest thing to track down just have a google for mem leak and check specifically against what you have installed.
Prob have to crawl threads such as https://www.reddit.com/r/raspberry_pi/c ... agnose_it/

Glad zram-swap-config worked for you but real purpose is to get ubuntu to update there shockingly outdated zram-config-0.5.deb
But yeah zram is a great kernel technology for extending ram usage.

User avatar
DarkPlatinum
Posts: 853
Joined: Thu Nov 02, 2017 2:30 pm
Location: Unknown
Contact: Website YouTube

Re: Raspberry Pi 3 Zram optimisation

Sat Mar 23, 2019 4:50 pm

1 * Raspberry Pi Zero W, 1 * Raspberry Pi 2, 1 * Raspberry Pi 3 1 * Raspberry Pi 3B + :mrgreen:

Check Out My Raspberry Site (Run on a Raspberry Pi 3B :) ): https://html.dynu.net

stuartiannaylor

Re: Raspberry Pi 3 Zram optimisation

Sat Mar 23, 2019 4:57 pm

DarkPlatinum wrote:
Sat Mar 23, 2019 4:50 pm
Got one here by novaspirit tech: https://html.dynu.net/index.php/increase-ram-zram/
Also again another that is out of date since kernel 3.15.

The problem isn't zram though its a memory leak.

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