Go to advanced search

by Rive
Fri May 13, 2016 11:35 am
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

@Rive You present your figures with no comment. How do you feel about them? Bear in mind that by not using turbo mode the lifespan of the chip is greater, so I feel that if we can get close to that performance peak then we are doing well. Looking at the sdbench results I notice that the read result...
by Rive
Fri May 13, 2016 1:40 am
Forum: Windows 10 for IoT
Topic: How to use Minecraft win 10 edition?
Replies: 5
Views: 2400

Re: How to use Minecraft win 10 edition?

jlukanc wrote:How do I run Minecraft Windows 10 edition on a Pi2 running IoT Core. Where is it located on a HDD?
:? Win10 Minecraft has to be downloaded from store.
by Rive
Fri May 13, 2016 1:17 am
Forum: Beginners
Topic: Digital Clock Settings
Replies: 18
Views: 63863

Re: Digital Clock Settings

mine is "%r" (and if you hoover the mouse over the time it gives date e.g., "Thursday 05/12/2006")
by Rive
Thu May 12, 2016 10:01 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

Benchmark baseline /config.txt dtparam=sd_overclock=100 arm_freq=1270 core_freq=500 over_voltage=4 sdram_freq=575 sdram_schmoo=0x02000020 over_voltage_sdram_p=6 over_voltage_sdram_i=4 over_voltage_sdram_c=4 v3d_freq=500 h264_freq=333 gpu_mem=192 Sysbench 113.4291s [email protected]:~ $ sysbench --num-...
by Rive
Thu May 12, 2016 5:22 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

With the same actual core speed, I don't see any significant difference in write performance between 4.1 and 4.4 - around 21.5 MB/s on 4.1 and 21.1 MB/s on 4.4 with my Verbatim card. I still think it is worth trying core_freq_min=200. I am not home at the moment.. Is the 21MB/s with turbo=1, and co...
by Rive
Thu May 12, 2016 4:33 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

@Rive Can you try with "force_turbo=1" in your config.txt? I get performance parity between 4.1 and 4.4 I tried turbo=1 previously in 4.4.9, it does increase the speeds somewhat, but not on par with 4.1(write speeds hover at around 17 MB/s, hdparm and read at around 40 MB/s up from around 35 MB/s),...
by Rive
Thu May 12, 2016 2:21 am
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

Oh yeah, there is, live dangerously and set avoid_warnings=2 in config.txt. Now, my red power lamp spends most of it's time off when I start xhpl. But it completes the run at 4.1GFlops. Also a different result for get_throttled. $ vcgencmd get_throttled throttled=0x70000 My understanding of that, i...
by Rive
Thu May 12, 2016 1:49 am
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

Rive, That 5.19 V mentioned on the element14 page says nothing about what the Pi can operate from. Only what they happened to measure with whatever PSU they were using at the time. Right. They used a 5V 2A psu, and at idle, it was drawing 5.19V. Point is, get a psu that can provide what the pi3 wan...
by Rive
Thu May 12, 2016 1:46 am
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

Rive, Ah, yes we did. Thing is, if a device intended to be powered by USB and does not actually work at 5.00 volts then that is a design failure. Well be that as it may, that is why I opted for the 5.25V PSU, and I have no power issues at all, and if you have read my threads, you know I am all abou...
by Rive
Thu May 12, 2016 1:37 am
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

Rive, I have got a pile of "normal" PSU's they have been powering Pis and other things for ages. None of them puts out 5.25V which I would say was abnormally high for a USB supply. The best of the bunch puts out 5.13V and is rated at 2.1 Amps. Even that dips down occasionally when running xhpl. I d...
by Rive
Thu May 12, 2016 1:16 am
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

Rive, Yes. Turns out although my power supply does not "droop" it seems to have pretty ropey regulation, I'll check it out with a scope tomorrow. Sadly I don't have any better PSUs to hand. What do I have to do? Strap the Pi 3 to the bus bars of a submarine battery. Why can't you use a normal psu? ...
by Rive
Thu May 12, 2016 1:04 am
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

So I got 3.162e+00 GFlops for xhpl with the kernel 4.4.9. Only problem is I don't recall what I got the old kernel. Can't find where I posted it here. I remember. It was 3.47 Gflops (which is really really bad considering a stock PI3 with 'over_voltage=1', benchmarks at 6 Gflops...or 6 billion oper...
by Rive
Wed May 11, 2016 11:30 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

Rive, No...Only this... But there was no such command as rpi-update on the machine. Now there is. Can't get it run with hanging the entire machine though, see above. Restore backup. I have never had to do a 'apt-get install rpi-update', only 'sudo rpi-update' . Are we not both on Jessie, linux 4.1....
by Rive
Wed May 11, 2016 11:21 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

Code: Select all

$ sudo apt-get install rpi-update
$ sudo rpi-update
No

Only this

Code: Select all

sudo rpi-update
by Rive
Wed May 11, 2016 10:59 pm
Forum: Troubleshooting
Topic: USBHID Mouse performance bug?
Replies: 7
Views: 1504

Re: USBHID Mouse performance bug?

With mousepoll=0 you get the default Linux behaviour, which with badly behaved devices can affect performance. That's why we have changed it to avoid the performance impact by default, but that may cause sluggish mouse. The options are: sluggish mouse Performance impact Use a different mouse So... ...
by Rive
Wed May 11, 2016 10:50 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

Heater wrote:dom,
Report "vcgencmd get_throttled" output after doing some activity. If you get a non-zero result I can decode it.

Code: Select all

$ vcgencmd get_throttled
error=1 error_msg="Command not registered"
What new firmware? This Pi 3 is all "apt-get ugraded".
Maybe?

Code: Select all

sudo rpi-update
by Rive
Wed May 11, 2016 10:45 pm
Forum: Troubleshooting
Topic: USBHID Mouse performance bug?
Replies: 7
Views: 1504

Re: USBHID Mouse performance bug?

Setting mousepoll to zero means it will use whatever polling interval the device requests. It could be that the wireless mouse is requesting a faster polling rate than the wired mouse which is going to increase the load on the CPU to keep reading at that speed. Normally if not set to anything it de...
by Rive
Wed May 11, 2016 10:16 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

Good. Well glad I could help. So you don't need me anymore? Am I good to reinstall 4.1.19 until these issues are resolved? Yes, thanks for the report. Feel free to switch back to 4.1.19, but hopefully there will be some fixes in the near future that we'll ask you to test. Just let me know...Thanks
by Rive
Wed May 11, 2016 10:14 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

So does this mean that the BT is causing the degradation? What about the sd_overclock ? No good anymore in 4.4.9? No, not BT directly. There are two uarts, either one can be used by BT, and the other can be used for serial output. I think the problem is with an unused uart is being left with an int...
by Rive
Wed May 11, 2016 9:52 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

does "dtoverlay=pi3-miniuart-bt" added to config.txt help the 4.4.9 performance? It appears to have disabled Bluetooth... No improvement in sdbench: HDPARM 36.38 MB/s READ 35.33 MB/s WRITE 14.82 MB/s Improvement in sybench (in line with 4.1.19 results): 114.3685s Improvement in linpack bench (in li...
by Rive
Wed May 11, 2016 9:24 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

@Rive does "dtoverlay=pi3-miniuart-bt" added to config.txt help the 4.4.9 performance? We have spotted what looks like unwanted serial interrupts occurring, they stop when that overlay is applied. (enable_uart=1 also seems to fix it). I am currently back on 4.1, but I will rpi-update, and add that ...
by Rive
Wed May 11, 2016 8:12 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

I cannot confirm a performace drop in 4.4.9 - as far as linpack is concened. Others untested. It isn't how high can you overclock, and what Gflop can you pass at on 4.4.9, it is a comparison between both kernels using the same benchmark parameters, config as a constant. ;) Run it in 4.1.19 and 4.4....
by Rive
Wed May 11, 2016 8:03 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

I don't use turbo mode, and it isn't enabled in /boot/config.txt (except apparently by "sd_overclock' in 4.1.19). My governor is 'ondemand' in both kernels (idling at 600 MHz). What happens if you set the CPU governor to performance in the 4.4.9 kernel? I dunno. I am currently on 4.1.19 atm. But I ...
by Rive
Wed May 11, 2016 7:49 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

There is a possibility that Pi 3 crashes and wrong results are related to the sudden reduction in CPU voltage when the CPU leaves turbo mode while executing NEON instructions. If so, then turning off turbo mode safely at boot would mitigate this fault. Cooling a system well enough that it naturally...
by Rive
Wed May 11, 2016 7:09 pm
Forum: General discussion
Topic: Raspbian Jessie linux 4.4.9 Severe Performance Degradation
Replies: 100
Views: 41547

Re: Raspbian Jessie linux 4.4.9 Severe Performance Degradati

There's nearly an order of magnitude more interrupts per second and context switches per second in the 4.4.9 case compared to 4.1. Interrupts/context switches incur an overhead - but having such a large disparity in numbers between kernel versions is suspicious. Something else i noticed is that the...

Go to advanced search