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post #11 of 22
Thread Starter 
Anyone have any comment on the stability issue? I can't seem to get nearly as high of a stable overclock in Linux vs windows or even stress tests.

It's weird I could pass stress testing for a couple hours with 4.4 or 4.57 with ht off. Then I'll go to boot linux later and crash while opening thunderbird and then reboot gives a cpu error. 4.25 or under seems to be fine. This is my first OC on linux box is this just normal for Linux?
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post #12 of 22
it would probably be more stable if you had a custom compiled kernal with something like gentoo could try that just for fun to see if it helps
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post #13 of 22
Quote:
Originally Posted by cavallino View Post
Anyone have any comment on the stability issue? I can't seem to get nearly as high of a stable overclock in Linux vs windows or even stress tests.

It's weird I could pass stress testing for a couple hours with 4.4 or 4.57 with ht off. Then I'll go to boot linux later and crash while opening thunderbird and then reboot gives a cpu error. 4.25 or under seems to be fine. This is my first OC on linux box is this just normal for Linux?
The stock answer is that Linux uses more of the CPU silicon than Windows for similar tasks and is therefore more sensitive to marginal overclocks. Whether that's true, I really have no idea. Though I have also observed the same thing, that overclocks which are "stable" in Windows are not at all stable in Linux.
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post #14 of 22
Thread Starter 
Quote:
Originally Posted by EntTheGod View Post
it would probably be more stable if you had a custom compiled kernal with something like gentoo could try that just for fun to see if it helps
Yeah I was thinking about giving gentoo a try anyway I may do that.

I just started using kernel 2.6.37-ck-core2 which is supposed to be optimized for 1st gen i3/i5/i7. Ill crank it up again and see how it goes, then try a custom kernel see if it makes a difference.
Edited by cavallino - 3/25/11 at 12:33pm
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post #15 of 22
Quote:
Originally Posted by cavallino View Post
Anyone have any comment on the stability issue? I can't seem to get nearly as high of a stable overclock in Linux vs windows or even stress tests.

It's weird I could pass stress testing for a couple hours with 4.4 or 4.57 with ht off. Then I'll go to boot linux later and crash while opening thunderbird and then reboot gives a cpu error. 4.25 or under seems to be fine. This is my first OC on linux box is this just normal for Linux?
Quote:
Originally Posted by cavallino View Post
Yeah I was thinking about giving gentoo a try anyway I may do that.

I just started using kernel 2.6.37-ck-core2 which is supposed to be optimized for 1st gen i3/i5/i7. Ill crank it up again and see how it goes, then try a custom kernel see if it makes a difference.
Gentoo will not actually solve your "OverClock" problem you can build a custom kernel from arch linux, as to if it will fix your stability issues, it might.

i have similar issues, the windows "stable" OC for me is 4.0GHz, but linux it is only about 3.5GHz. without getting too technical, it simply wasn't stable at 4.0GHz, just "appeared" to be.

as for error10's "comment", that i can't say is true or not, i've definitely heard it before. there are tons of architectural differences between the two OS's, that could be the culprit as to why one can run at a less stable OC than the other, but i wasn't aware "stability" was OS dependent , cause i've had OC's that have tested for 24 hours in windows as stable, then 6 months down the line without any change, become unstable
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post #16 of 22
Thread Starter 
Quote:
Originally Posted by transhour View Post
Gentoo will not actually solve your "OverClock" problem you can build a custom kernel from arch linux, as to if it will fix your stability issues, it might.

i have similar issues, the windows "stable" OC for me is 4.0GHz, but linux it is only about 3.5GHz. without getting too technical, it simply wasn't stable at 4.0GHz, just "appeared" to be.

as for error10's "comment", that i can't say is true or not, i've definitely heard it before. there are tons of architectural differences between the two OS's, that could be the culprit as to why one can run at a less stable OC than the other, but i wasn't aware "stability" was OS dependent , cause i've had OC's that have tested for 24 hours in windows as stable, then 6 months down the line without any change, become unstable
Yeah I did some experiments with other kernel today. I used mprime from the AUR for testing. I gave each a half hour I went longer with testing in windows but this is just a quick test

The standard Arch kernel 2.6.38-Arch can do 4.25 max.

The ck-core2 kernel is good until about 4.40

I then tried to compile my first kernel from source. Boot time was great since I stripped out all the unnecessary modules but couldn't get stable on anything higher than 4.25 like the arch kernel.

the ck kernel is supposed to be geared towards desktop performance and the core2 version is for i3/5/7's, or maybe it was just a fluke that it made it to 4.40. I'm running it now so we'll see. 4.40 is the max I can get at safe voltage with HT on anyway.
Edited by cavallino - 3/25/11 at 9:19pm
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post #17 of 22
Quote:
Originally Posted by cavallino View Post
Yeah I did some experiments with other kernel today. I used mprime from the AUR for testing. I gave each a half hour I went longer with testing in windows but this is just a quick test

The standard Arch kernel 2.6.38-Arch can do 4.25 max.

The ck-core2 kernel is good until about 4.40

I then tried to compile my first kernel from source. Boot time was great since I stripped out all the unnecessary modules but couldn't get stable on anything higher than 4.25 like the arch kernel.
why don't you take the config file for the ck-core2 kernel and build a custom kernel stripped of all the unneeded modules?

zcat /proc/config.gz > .config
make oldconfig
make menuconfig

(should work as long as the config is included in the compiled kernel...if not, check /boot see if there is like config-2.6.xx-ck-core2, and copy that over to your kernel source you're building from.)

cp /boot/config-2.6.xx-ck-core2 .config
make oldconfig
make menuconfig
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post #18 of 22
Thread Starter 
Yeah thats my next step now that I found the best performing kernel.
Edited by cavallino - 3/25/11 at 9:32pm
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post #19 of 22
Greetz
IIRC the main reason, that is with stock kernels, that Linux may sometimes allow only a lesser overclock has to do with SMP implementation. Linux has been multl-processor compliant from the beginning, and therefore a jump on multi core, due to it's inheritance from Unix. This is over a decade more mature in Linux/ You will see less idle time on secondary cores in Linux and that means more heat.

I have never seen this issue on a single core box. In fact, even with a custom kernel with considerably more aggressive timing all my single core OCs have held up just fine as compared to Windows CPU frequency. It is also omportant to remember than mere frequency is not a measure of work or work potential. The important factor is IPS, Instructions per Clock and that in multi-core is affected by the kernel and the applications written to utilize the cores.
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post #20 of 22
Thread Starter 
Very interesting. Thanks for the input.
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