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Wrong frequency in Linux

post #1 of 22
Thread Starter 
So I've been playing around overclocking my Linux rig. I'm running at 4.577 with an i3 560 with HT off. Now heres the weird thing, Linux keeps reporting the frequency as 4977mhz when it should be 4577? I noticed it first in conky but using cat /proc/cpuinfo returns the same result. confused.gif

This is on Arch Linux x86_x64
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post #2 of 22
You're overclocking in the BIOS right?
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post #3 of 22
Thread Starter 
Yes

I lowered it down back to the too rule out stability issues I went down to the time proven stable 4.40 with ht on and now it says 5000mhz.

Also I forgot to mention windows on the same machine reports correctly running off a second disk I use for testing.

Did a cmos reset and no change.
Edited by cavallino - 3/24/11 at 7:00pm
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post #4 of 22
Quote:
Originally Posted by cavallino;12859791 
So I've been playing around overclocking my Linux rig. I'm running at 4.577 with an i3 560 with HT off. Now heres the weird thing, Linux keeps reporting the frequency as 4977mhz when it should be 4577? I noticed it first in conky but using cat /proc/cpuinfo returns the same result. confused.gif

This is on Arch Linux x86_x64

Long known issue. Last time I talked to the person responsible, he basically said "don't overclock" and refused to fix it.
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post #5 of 22
Thread Starter 
Quote:
Originally Posted by error10;12860642 
Long known issue. Last time I talked to the person responsible, he basically said "don't overclock" and refused to fix it.

Ok thank you!

You always seem to answer my questions +rep
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post #6 of 22
Quote:
Originally Posted by cavallino;12860690 
Ok thank you!

You always seem to answer my questions +rep

Thanks. Sorry it wasn't better news.

I wrote some code a while back that accurately detected the CPU frequency when overclocked, but then promptly misplaced it. Might even have deleted it by mistake. If I run across it, I'll be sure to post here. smile.gif
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post #7 of 22
Thread Starter 
Yeah its kind of weird. If only I was actually running at 5000mhz. tongue.gif

I am having some stability issues as well. It will pass stress tests fine in windows but if I use a setting that causes the freq error it seems to crash linux. It looks like bclk over ~185 causes the problem.

Example 21x200 causes the cpu freq error but 25x175 will be fine. Both pass stress tests though.
Edited by cavallino - 3/24/11 at 9:19pm
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post #8 of 22
The cpuinfo code doesn't take Intel Turbo Boost into account properly; so it doesn't display correctly even on non-overclocked systems when Turbo Boost (the extra 1x) is active.
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post #9 of 22
Quote:
Originally Posted by error10;12861536 
The cpuinfo code doesn't take Intel Turbo Boost into account properly; so it doesn't display correctly even on non-overclocked systems when Turbo Boost (the extra 1x) is active.

yeah it has to do with the cpufreq dilly dad in the kernel...i just came across an article the other day that explained how to fix it (it is actually running at the speed it is said in bios, just doesn't display correctly.)

if i come across the how to, i will post the link smile.gif
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post #10 of 22
Quote:
Originally Posted by error10;12860642 
Long known issue. Last time I talked to the person responsible, he basically said "don't overclock" and refused to fix it.

The problem is the motherboard reports the wrong values to the kernel because the motherboard makers don't give a **** and only comply with MS's weird ACPI standards. I had a talk with the guy who maintains the Linux code for this and he said "complain to the motherboard manufacturers for doing the **** incorrectly."
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