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by shalo
Mon Aug 13, 2012 1:56 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

That stuff about the avoid_pwm_pll 1 and quake3 audio is wrong. Analogue (don't know about hdmi) audio doesn't work at all for me with Q3 and the newest kernel/modules from rpi-update. Copying over the old .ko works but it seems like it's because the boot process is doing some sort of fallback. Duri...
by shalo
Sun Aug 12, 2012 9:40 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

I didn't really think just copying the .ko file would do anything other than complain about version matches :) Yes, you should grab the kernel.img and snd-bcm2835.ko from the same git commit to avoid version mismatches. Sure, but to clarify the difference originally arose with the two kernels with ...
by shalo
Sun Aug 12, 2012 7:11 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

So are you saying an update to snd-bcm2835.ko made audio quality worse when avoid_pwm_pll is enabled? Can you point at the git commit for kernel (or uname -a version) that introduced the degredation? It's hard to be precise. I would say the sound in xbmc is the same with both kernels, though given ...
by shalo
Fri Aug 10, 2012 7:09 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

vcgen c md for what I referred to as newest shows: Aug 8 2012 22:55:02 Copyright (c) 2012 Broadcom version 330232 (release) I suspect the other firmware was: Aug 1 2012 19:48:24 Copyright (c) 2012 Broadcom version 328870 (release) I've just taken these details from a 240mb split on a different pi t...
by shalo
Fri Aug 10, 2012 5:24 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

@shalo Can you confirm with: /opt/vc/bin/vcgenmd version exactly what the two firmwares you are referring to. Ideally they will be consecutive firmware versions from github, so I can look through a small set of source changes to get some idea of the problem. vcgen c md for what I referred to as new...
by shalo
Fri Aug 10, 2012 1:30 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

Soooo, "Allow PWM PLL to be repurposed for H264/ISP/V3D." I guess this might be a way to unlink H264/ISP/V3D from core_freq? Yes, avoid_pwm_pll=1 in config.txt. The PWM PLL will be freed up (anlogue audio should still work, but from a fractional divider, so lower quality). H264/ISP/V3D are tied tog...
by shalo
Fri Aug 10, 2012 11:57 am
Forum: Raspbian
Topic: A little help required
Replies: 10
Views: 1849

Re: A little help required

I have just loaded raspbian using the installer on my 2 pi's but I have a few issues: 1) I can not use 'sudo' but have to log in as 'su' to do anything. 2) I can not find a desktop environment, 'startx' can not be found. 3) 'rpi-update' seems to work ok but throws out a few errors when it updates. ...
by shalo
Fri Aug 10, 2012 11:43 am
Forum: Advanced users
Topic: MPEG-2 Decoding
Replies: 230
Views: 83983

Re: MPEG-2 Decoding

I guess it may only be slightly related but I think could be of interest to people involved in this thread. Check out the notes for the latest pi firmware, "Preparation for additional codecs".

see: https://github.com/raspberrypi/firmware
by shalo
Thu Aug 09, 2012 8:23 pm
Forum: Raspbian
Topic: Please test my compiled quake3
Replies: 4
Views: 1289

Re: Please test my compiled quake3

Hi guys I'm having fun cross-compiling things for R-Pi on my Lubuntu machine. Unfortunately, I'm still waiting for my Pi so I can't test it myself. I would be grateful if somebody could test this for me. It is compiled using hardfp so it will probably only work on raspbian images. Unpack the archiv...
by shalo
Wed Aug 08, 2012 10:09 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

What SD cards are you guys using, if using them at all? I tried 3 sd cards with different overclock stability results on raspbian wheezy official 2012-7-15 no updates, upgrades performed. I don't know if drives are factor on overclocks but these are some rough tinkering with observations. All of th...
by shalo
Sun Aug 05, 2012 6:13 pm
Forum: Advanced users
Topic: Couple of questions
Replies: 3
Views: 3368

Re: Couple of questions

I got a couple of questions about this Pi. First being, when is GPU-level rendering expected for X11? and also, what GPU does the Pi have? My model is the one with the Samsung chip. 1. Accelerated X11: Not for a while, only a handful of people have the know-how, and they're busy tackling other Foun...
by shalo
Sun Aug 05, 2012 1:20 pm
Forum: Troubleshooting
Topic: HDMI failed suddenly (solved)
Replies: 5
Views: 1025

Re: HDMI failed suddenly

PeterHuitsingh wrote: A little disapointed I hook the Pi back to my monitor. Nothing! No signal! the monitor says.

Peter
Just to be certain because it's kind of ambiguous but you are switching the monitor/tv on before the pi right?
by shalo
Fri Aug 03, 2012 1:19 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

I take it you are not using the gpu's 3d or h264? 1/3 x 300 and 2/3 x 225 = 250? Someone smack me if I try to make sense of anyone elses config again. Woops, selected the wrong button. Maybe someone can delete the duplicate post preceeding. I just defaulted on everything else. Are there any buideli...
by shalo
Fri Aug 03, 2012 12:50 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

No overvolt. I'll see if the chips get hot to touch. Room temperatures here are running 80's F about 27C. Remember, the SOC is designed for cellphones and that as I understand it, these cell phones even work near the Equator. I've seen people leave their cell phones out in direct sunlight all day l...
by shalo
Fri Aug 03, 2012 12:39 pm
Forum: Raspbian
Topic: Rar and unrar on Raspbian
Replies: 24
Views: 128569

Re: Rar and unrar on Raspbian

What would the performance be with the Raspberry when unpacking rar archives. Roughly how long would it take to unrar a gigabyte of data for instance? Let's see. Some samples from my 800mhz Pi. All these files are on a USB harddrive and unpacked to the same USB harddrive. I have not tested the spee...
by shalo
Fri Aug 03, 2012 12:19 pm
Forum: Advanced users
Topic: Benchmark program
Replies: 10
Views: 6887

Re: Benchmark program

Is'nt the "core" speed something like the "bus" speed? otherwise i could not guess what "arm" and "gpu" speed changes... :shock: maybe there are some commands or a proggie that i can use to shed some light on this matter.... i used these settings becouse i stumbeled upon a post that mentioned to us...
by shalo
Fri Aug 03, 2012 12:15 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

This one's running at arm_freq=900 core_freq=450 sdram_freq=450 Do note re-boot filled the screen with error messages. Power off/power on worked. Also note at defaults the screen was filled with 1280x720 while overclocked it's at 1366x768 which is the TV's rating. A little bit of underscan vertical...
by shalo
Fri Aug 03, 2012 12:03 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

After a good bit of playing around, the best my Pi can cope with is this: arm_freq=911 core_freq=422 sdram_freq=500 over_voltage=0 over_voltage_sdram=1 These values are backed off a little bit from what appeared to be stable and are the best mix of CPU and GPU performance I could manage. Note that ...
by shalo
Thu Aug 02, 2012 9:39 pm
Forum: Advanced users
Topic: Benchmark program
Replies: 10
Views: 6887

Re: Benchmark program

Oh yes, typing: less /boot/config.txt shows: arm_freq=900 gpu_freq=450 core_freq=300 And: cat /proc/cpuinfo Shows: 898.66 BogoMIPS And it runs verry nice indeed! :mrgreen: Why do you ask? Well, it's very odd. You have the gpu running faster than the core, possible but let's see what your settings m...
by shalo
Thu Aug 02, 2012 8:52 pm
Forum: Advanced users
Topic: Benchmark program
Replies: 10
Views: 6887

Re: Benchmark program

Ed Raket wrote:My Pi runs really great with current settings! tested under x and with several games

Code: Select all

cpu_freq=900
gpu_freq=450
core_freq=300
Are you sure those are your settings?
by shalo
Thu Aug 02, 2012 3:36 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

After a good bit of playing around, the best my Pi can cope with is this: arm_freq=911 core_freq=422 sdram_freq=500 over_voltage=0 over_voltage_sdram=1 These values are backed off a little bit from what appeared to be stable and are the best mix of CPU and GPU performance I could manage. Note that ...
by shalo
Thu Aug 02, 2012 2:16 pm
Forum: Advanced users
Topic: Overclocking success over 1GHz?
Replies: 39
Views: 21050

Re: Overclocking success over 1GHz?

"The silicon goes trough a complex curve. Too hot or too cold does not work.............The PI does net get hot so cooling it does not help." "We have run them a prolonged time at 80 degr. Celsius in an oven with no problems. The Theta-J with an airflow of 0m/sec is ~35 C/W. This is with a PoP memor...
by shalo
Wed Aug 01, 2012 10:02 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

Soooo, "Allow PWM PLL to be repurposed for H264/ISP/V3D."

I guess this might be a way to unlink H264/ISP/V3D from core_freq?
by shalo
Wed Aug 01, 2012 4:14 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

Short answer, because I used to do this. Random sample of boards, crank up the clock, crank up the the voltage. Wait for them to fail. Document the failure points and then look for trends. It is a lot more complicated than this but a high level it is how destructive testing performed. But you canno...
by shalo
Wed Aug 01, 2012 3:23 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 620819

Re: Overclocking

I'm betting any overclock testing done was just upping the clock frequency until they started seeing calculation errors. I wouldn't make that bet if I were you. If you mean me, I was not referring to either Eben or indeed dom. I was very specific and here are some direct quotes from one of the guys...

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