Go to advanced search

by lingon
Fri Feb 13, 2015 8:00 pm
Forum: Troubleshooting
Topic: Only 2.85 BogoMIPS
Replies: 4
Views: 1409

Only 2.85 BogoMIPS

On a Raspberry Pi Model B I see only 2.85 BogoMIPS, which seems very strange as it is usually around 700 on the Raspberry Pi? uname -a Linux rpicam2 3.18.7+ #755 PREEMPT Thu Feb 12 17:14:31 GMT 2015 armv6l GNU/Linux cat /proc/cpuinfo processor : 0 model name : ARMv6-compatible processor rev 7 (v6l) ...
by lingon
Wed Feb 04, 2015 7:51 pm
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 129164

Re: The Raspberry Pi 2 Q&A thread

pi@pi2 ~ $ sudo hdparm -Tt /dev/mmcblk0p2 /dev/mmcblk0p2: Timing cached reads: 974 MB in 2.00 seconds = 486.81 MB/sec Timing buffered disk reads: 56 MB in 3.09 seconds = 18.11 MB/sec pi@pi2 ~ $ pi@pi2 ~ $ sudo hdparm -Tt /dev/sda2 /dev/sda2: Timing cached reads: 960 MB in 2.00 seconds = 480.20 MB/s...
by lingon
Wed Feb 04, 2015 6:22 am
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 129164

Re: The Raspberry Pi 2 Q&A thread

It would be nice if someone with a Raspberry Pi 2 would run

Code: Select all

hdparm -Tt /dev/mmcblk0p2
against the micro SD card as well as against a USB-drive

Code: Select all

hdparm -Tt /dev/sda1
and post the results here. The expected improvement in cached reads would be interesting to see.
by lingon
Mon Oct 27, 2014 3:29 pm
Forum: Advanced users
Topic: Memory performance with kernel 3.12.30+ #717 has increased
Replies: 0
Views: 673

Memory performance with kernel 3.12.30+ #717 has increased

The changelog for the firmware update that comes with kernel 3.12.30+ #717 says: "kernel: Improve __copy_to_user and __copy_from_user performance Provide a __copy_from_user that uses memcpy. On BCM2708, use optimised memcpy/memmove/memcmp/memset implementations." This update gives a significant perf...
by lingon
Tue Sep 09, 2014 2:50 pm
Forum: Camera board
Topic: MMAL Motion - tuning & optimisations
Replies: 161
Views: 121357

Re: MMAL Motion - tuning & optimisations

Firmware is already out with commit https://github.com/Hexxeh/rpi-firmware/commit/34662b3f2af52e1df897553f2a5a7455035adf85 The likelihood is that you're already running the binned modes as they will be automatically selected if you're asking for 30fps - I wouldn't fret about getting that in as a ne...
by lingon
Sat Aug 30, 2014 6:03 pm
Forum: Camera board
Topic: MMAL Motion - tuning & optimisations
Replies: 161
Views: 121357

Re: MMAL Motion - tuning & optimisations

Would it be possible to use the 2x2 binning modes with MMAL Motion with the new parameter MMAL_PARAMETER_CAMERA_CUSTOM_SENSOR_CONFIG ?
http://www.raspberrypi.org/forums/viewt ... 43&t=85714
This would be great for low light situations...
by lingon
Wed Feb 12, 2014 8:41 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 310857

Re: SD Card Benchmarks

I measured one of the Raspberry PI NOOBS 8 GB uSD cards that I received today in a native SD cardreader in a HP 4330s laptop. The cards are marked: MMCTR08GUBCH-ML K PSX773ZV 351 Made in PHILIPPINES These are the CrystalDiskmark results for one of my cards: ------------------------------------------...
by lingon
Fri Jan 31, 2014 6:39 am
Forum: Advanced users
Topic: Is UHS-I support coming?
Replies: 1
Views: 1007

Re: Is UHS-I support coming?

It would be nice if Gordon would elaborate on his use of the word "yet" in this context.
by lingon
Mon Jan 20, 2014 3:08 pm
Forum: Advanced users
Topic: Is UHS-I support coming?
Replies: 1
Views: 1007

Is UHS-I support coming?

The SD-hardware in the Raspberry Pi lacks one line to drive to voltage down to reach higher SD speed modes. When the 8 GB NOOBS SD-card was announced Gordon wrote this in the comments to the release note: But the card you’ve both has another mode that we don’t (yet) support for UHS (Ultra High Speed...
by lingon
Wed Jan 15, 2014 5:55 am
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 310857

Re: SD Card Benchmarks

jdb wrote:NOOBS 8GB SD card w/ USB3.0 reader

MMCTR08GUBCH-ML
Thanks for sharing the NOOBS card USB3.0 results as well!
by lingon
Tue Jan 14, 2014 9:09 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 310857

Re: SD Card Benchmarks

mikerr wrote:8GB Raspberry PI NOOBS card:

MMCTR08GUBCH-ML
D HTIA02GB 343
Made in KOREA

Benchmarks looking really good, beating the sandisk !
Thanks for sharing this result! I agree that it looks like a very good card for random writes.
by lingon
Sat Jan 11, 2014 8:33 pm
Forum: Camera board
Topic: Official V4L2 driver
Replies: 561
Views: 510403

Re: Official V4L2 driver

I'm submitted a change to night mode that increases the exposure to 0.97s (max), increases the max analog gain to 8 , and increases the total gain (analog* digital) to 16 (so max digital gain = 2). Not sure when the next firmware drop will be though. Certainly seem to make a difference in v. dark c...
by lingon
Fri Dec 27, 2013 9:34 am
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 310857

Re: SD Card Benchmarks

I found this link with CrystalDiskMark results for a SD-card with a similar but not exactly same type at http://r-2ch.com/t/smartphone/1369656716/ The NOOBS card is MMCTR08G3ACH-QNJMK and the benchmarked card is MMCTR08G3ACH-MM. The result for the MMCTR08G3ACH-MM card is not so impressive for random...
by lingon
Fri Dec 27, 2013 9:24 am
Forum: Troubleshooting
Topic: rpi-update fails when overclocking
Replies: 3
Views: 1136

Re: rpi-update fails when overclocking

The SD-driver has been improved a lot lately, thanks to the hard work of the developers. Previously I have too been bitten by crashed filesystems on three different Raspberry Pi machines. With the updated SD-driver I have seen no issues so far. I have previously run the overclocking stability test a...
by lingon
Thu Dec 26, 2013 10:40 am
Forum: Troubleshooting
Topic: rpi-update fails when overclocking
Replies: 3
Views: 1136

rpi-update fails when overclocking

After the SD-driver bugfixes I have started to test once more with overclocking. On a 512 MB Raspberry Pi Revision : 000e rpi-update failed with this error message: ... Cloning into '//root/.rpi-firmware'... remote: Counting objects: 3203, done. remote: Compressing objects: 100% (2675/2675), done. e...
by lingon
Wed Dec 18, 2013 6:57 am
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 310857

Re: SD Card Benchmarks

I wonder if someone with the Raspberry Pi NOOBS SD-card by Samsung MMCTR08G3ACH-QNJMK has run CrystalDiskMark or IOzone benchmarks on it? The announcement of the NOOBS card at http://www.raspberrypi.org/archives/4536 says the card should be fast for random I/O: Fast, pre-programmed, high-capacity ca...
by lingon
Tue Dec 17, 2013 7:10 pm
Forum: General discussion
Topic: Porting the Wayland graphics engine to the BCM2835
Replies: 3
Views: 1590

Re: Porting the Wayland graphics engine to the BCM2835

While waiting for Wayland for the Raspberry Pi you can enjoy a faster X11 driver already today . See this thread for details http://www.raspberrypi.org/forum/viewtopic.php?f=63&t=45746 You can install it on Raspbian with: sudo apt-get update && sudo apt-get install xserver-xorg-video-fbturbo fbturbo...
by lingon
Sat Dec 14, 2013 11:19 am
Forum: General discussion
Topic: Experimental enhanced X driver (rpifb)
Replies: 98
Views: 57837

Re: Experimental enhanced X driver (rpifb)

This looks very good based on my short testing with Midori and a couple of terminal windows. The performance is significantly better when scrolling webpages in Midori or when moving windows around the screen. Many thanks for this work! Should the name of this thread be changed to reflect the name of...
by lingon
Wed Dec 11, 2013 7:55 pm
Forum: Troubleshooting
Topic: USB redux
Replies: 514
Views: 221482

Re: USB redux

It's quite possible that the problem is you've got a hub with a single transaction translator (this is the thing that converts USB2 to USB 1 for things like keyboard and mouse's etc. You can check by doing lsusb -v to output the information and look for the hub descriptor (there will be at least th...
by lingon
Mon Dec 09, 2013 5:33 am
Forum: Troubleshooting
Topic: USB redux
Replies: 514
Views: 221482

Re: USB redux

Does the problem still occur if you remove the external hub? I disconnected the hub and now the uptime has been almost nine days without the USB/ethernet disconnection problem occuring. So yes it looks like that the problem is related to the hub. Is this a known problem? Is there some workaround fo...
by lingon
Fri Dec 06, 2013 8:29 pm
Forum: Troubleshooting
Topic: USB and Ethernet periodic failure
Replies: 5
Views: 1080

Re: USB and Ethernet periodic failure

Hi A have a PI running 24/7 on a remote location only with SSH access and a good friend who can unplug and plug the power cable... ;) From time to time it appears that the Ethernet connection on the Pi dies and maybe also the USB. Do you have a USB hub connected to the Pi? I have a similar problem ...
by lingon
Thu Nov 28, 2013 8:14 pm
Forum: Troubleshooting
Topic: USB redux
Replies: 514
Views: 221482

Re: USB redux

On a Raspberry Pi Model B with 512 MB RAM I have the problem that the USB interface stops working. The ethernet LEDs seem to work normally, but no ethernet connection is possible when the USB system has stopped working. Previously this has been a rare problem occurring when the computer has been id...
by lingon
Sat Nov 09, 2013 10:57 pm
Forum: Camera board
Topic: Exposure time stays at 1/6173 s
Replies: 0
Views: 479

Exposure time stays at 1/6173 s

My Raspberry Pi Model B with a camera board is in an area where there are frequent short power outages, which makes the computer reboot. If it is dark when this happens, the camera exposure time goes to 1/6173 s and stays there until the camera is restarted in bright conditions. I'm using the option...
by lingon
Sat Nov 09, 2013 10:48 pm
Forum: Camera board
Topic: Permanently turn AWB off
Replies: 125
Views: 39706

Re: Permanently turn AWB off

I have been using -awb sun to try to get more stable whitebalance. Unfortunately this does not seem to work. Even during night the white balance is fluctuating. I have seen that the color of a street light at night can fluctuate from one frame to the next.
by lingon
Sat Nov 09, 2013 7:29 pm
Forum: Troubleshooting
Topic: USB redux
Replies: 514
Views: 221482

Re: USB redux

On a Raspberry Pi Model B with 512 MB RAM I have the problem that the USB interface stops working. The ethernet LEDs seem to work normally, but no ethernet connection is possible when the USB system has stopped working. Previously this has been a rare problem occurring when the computer has been idl...

Go to advanced search