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by shalo
Sat Jul 26, 2014 12:45 pm
Forum: Advanced users
Topic: Determining how fast your Pi really is
Replies: 62
Views: 17615

Re: Determining how fast your Pi really is

Updated my previous post regarding "over_voltage=6". You cannot damage the device by overclocking. What about over-volting? What are the absolute maximum tested values for all of the variables, with and without force_turbo enabled? As I recall 6 is the maximum it allows without force_turbo. Using f...
by shalo
Sat Jul 26, 2014 12:19 am
Forum: Advanced users
Topic: Determining how fast your Pi really is
Replies: 62
Views: 17615

Re: Determining how fast your Pi really is

zardoz99 wrote:Rev 0010

[root@pidora ~]# vcgencmd read_ring_osc
read_ring_osc(2)=2.934MHz (@1.20V)
This is not helpful without the overclock info :(
by shalo
Thu Jul 24, 2014 11:59 pm
Forum: Advanced users
Topic: Determining how fast your Pi really is
Replies: 62
Views: 17615

Re: Determining how fast your Pi really is

Snailface wrote:

Code: Select all

Model/Speed
A    read_ring_osc(2)=3.157MHz (@1.20V)
B(1) read_ring_osc(2)=2.935MHz (@1.20V)
B+   read_ring_osc(2)=2.865MHz (@1.20V)
B(2) read_ring_osc(2)=2.754MHz (@1.20V)
Turns out my fastest system is the one I use the least. Just my luck. :lol:
This would be useful with the overclock info.
by shalo
Mon Jul 21, 2014 8:23 pm
Forum: Advanced users
Topic: Determining how fast your Pi really is
Replies: 62
Views: 17615

Re: Determining how fast your Pi really is

Seeing posts that are just the one value which doesn't help with data collection. I included the 1.4v value though since that's what I used for the overclock. 256mb Model B (Samsung Ram) 3.002Mhz @ 1.2v 3.880Mz @ 1.4v Arm: 1100mhz Core: 600mhz Ram: 600mhz over_voltage: 1.4v (Headless stress tested f...
by shalo
Mon Jul 01, 2013 2:08 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

So the limit of sdram=600? I've set 710 on my config.txt, I guess my Pi was ignoring this value. Is there a command to verify the sdram? I don't really understand how anyone is verifying anything. How did you test it to arrive at a figure of 710? If ~600 works, anything over 600 should work just th...
by shalo
Sat Jun 29, 2013 12:11 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

The ram used to have a hard cap at 600mhz which with early models Samsung hit very easily and Hynix were lucky to hit 500 with no overvolting so it may be worth pointing out which ram you have.

I assume this was 1/4 of 2400 or something and that this limit no longer applies?
by shalo
Wed Dec 19, 2012 2:29 pm
Forum: Advanced users
Topic: Raspbmc USB/CEC questions
Replies: 4
Views: 6536

Re: Raspbmc USB/CEC questions

As far as CEC, I don't think it necessarily means that your TV would find your Pi as a DVR device or anything. It means that your TV remote control can do things in Raspbmc. Although, all I have figured out for mine (LG Simplink) is that remote cursor keys can scroll menus up/down/across, and can s...
by shalo
Mon Oct 29, 2012 11:20 am
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

Only overvolt of 6 or less. Actually, over_voltage=8 doesn't set the warranty but it will get limited to 8 . force_turbo=1 does set the warranty bit, and will not limit the over_voltage setting. I think that's a typo and should read, "but will get limited to 6". Yes, without force_turbo (or current...
by shalo
Sat Oct 06, 2012 11:11 am
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

And @shalo, I set sdram_freq to 800 to test if it was being read and my pi didn't even try booting. Revision numbers also indicate Samsung memory so that explains that. Benchmarking against sdram_freq didn't show much difference, not like an overclock to 1.1GHz did. Thanks for your input. That must...
by shalo
Fri Oct 05, 2012 12:37 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

sdram_freq=600 However sdram_freq seems abnormally high with no overvolt, is there a way I check it is set correctly? It has been mentioned a few times in this thread. There is/was a cap on sdram_freq related to the PLL used. I think it is slightly under 600mhz but not certain this has ever been co...
by shalo
Sat Sep 22, 2012 4:31 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

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
Thu Sep 20, 2012 4:26 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

Dom, it seems that overvolting and using the performance governor doesn't void the warranty. You might want to address this problem. Also the new turbo mode (1000MHz ARM, 500MHz core, 500MHz SDRAM, 6 overvolt) is unstable for my particular Pi. My stress test method is running, dd if=/dev/zero | ssh...
by shalo
Fri Sep 07, 2012 2:48 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

Latest firmware changes the PLL frequency used. The PLL is set to the largest N such that core_freq*2*N < 2.4G. In fact it rounds to nearest even integer, so asking for gpu_freq=300 will result in divisor of 2000/300 = 6.666 => 6 and so 333.33MHz I'm just going to go ahead and reiterate, it can't h...
by shalo
Sun Sep 02, 2012 1:39 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

<Q3, gpu, ram> On quake3 with sound, you can use the ingame command at the console /snd_restart I remember it being a touch flakey when using analogue audio at times. Usually requiring a /snd_restart soon after launch. Your gpu observations match mine also. I find almost no way leeway on the gpu_fr...
by shalo
Sat Sep 01, 2012 11:45 am
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

I just read about the High limit on PLL. Is there any way to check what you are actually running? You can only really test it. The difference in memory bandwidth from 550 to 600 appears to be marginal though does seem to exist. I believe dom was going to look into it and see what the exact situatio...
by shalo
Fri Aug 31, 2012 9:21 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

The gpu_freq will go up to 550 (that's as much as I've attempted so far) and still boot and seemingly run fine but some games will eventually cause the system to lock up when it's at 500 or 550 so I may need to look into lowering that setting until I find an overclock that's suitable. Have you trie...
by shalo
Sun Aug 26, 2012 7:18 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

Nice data there @shalo. I have a RasPi with the Hynix memory and it does not overclock well at all. Stability problems. The SoC isn't much better. I only made it to 950 with an overvolt of 8 and it still was not stable. It runs ok at 900 with an overvolt of 6. I am running it now at 800 with no ove...
by shalo
Sun Aug 26, 2012 4:35 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

Hi, The short version: Anyone have a way of measuring the effects of raising sdram_freq? Yes, I use membench. https://github.com/ssvb/ssvb-membench I've pulled out four columns that show roughly the difference. The fourth in red is actually a different pi with Hynix ram that doesn't easily do whate...
by shalo
Wed Aug 22, 2012 2:55 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

I hope understand now. It good practice to check if core x 2 freq can be divided with integer to get freq of 3d/h264/etc. So properly overclocking algo looks like this find stable core_freq step up rest of components to core_freq*2/integer freq continue until it still works. And if you don't touch ...
by shalo
Wed Aug 22, 2012 12:21 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

I didn't quite got the idea about divider/divisor. How do you configure it in /boot/config.txt If I set core_freq=350mhz - which divisor will be used for the rest of gpu components? That's not quite the right question. If you set core_freq=350mhz then the core will run at 350mhz. Everything else wi...
by shalo
Sat Aug 18, 2012 8:57 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

After reading your edit I will change the spreadsheet accordingly. The question is then what would be the lowest (usable) divisor. 1/6? Hard to say, the gpu downlocks/powersaves on its own apparently, so there's no real mileage from that point of view. It seems to me that there is little point choo...
by shalo
Sat Aug 18, 2012 9:33 am
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

Yep that was a bad example. I guess I should have put it into the spreadsheet I wasted my time making! :lol: It was not an integer divisor. As long as it is an integer divisor it should work then; Some examples from the spreadsheet. One Half of pll is always going to be a valid number. If core_freq...
by shalo
Sat Aug 18, 2012 12:32 am
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

@dom @shalo I built a spreadsheet to show the valid integer divisors of core_freq. Shows product and true or false for integer. What I would like to know; one half and one third are valid divisors, are 2/5 and 3/5 valid? instance: (3/5) core_freq=500 gpu_freq=300 or h264_freq=300 isp_freq=300 v3d_f...
by shalo
Fri Aug 17, 2012 10:23 pm
Forum: Advanced users
Topic: Overclocking
Replies: 1125
Views: 647989

Re: Overclocking

The h264 issue seems to exist on all firmware that has the option of avoid_pwm_pll and when using that option set to 1, no matter what the core/gpu/h264 block is set to or not set to. I've spoken to clocks guy, and think I've got a fix for avoid_pwm_pll + H264. Try after an rpi-update. Seems to wor...
by shalo
Thu Aug 16, 2012 5:37 pm
Forum: Raspberry Pi OS
Topic: SMB transfers -> unresponsive RPi
Replies: 3
Views: 4830

Re: SMB transfers -> unresponsive RPi

I've setup a headless raspbian rpi using Hexxahs image and it's running of an external USB HDD with a memory split of 240/16. I've installed lighttpd, dokuwiki and samba. I've tried transfering 189 GB (1349 files; a mix of small (0-1 MB) and large (1-4 GB) files) from a Windows box to a smb share o...

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