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adrin n00b
Joined: 27 May 2006 Posts: 41
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Posted: Mon Feb 04, 2008 8:38 pm Post subject: Overclocked Core 2 Duo (E2xxx) and freq scaling |
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Will frequency scaling work on an overclocked Pentium Dual Core (C2D) CPU?
It seems that scaling works when the cpu isnt OCed, and after i overclock it cpufreqd does not detect my CPU (unknown cpu or similar error) _________________ *a* |
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your_WooDness Tux's lil' helper
Joined: 25 Oct 2007 Posts: 77
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Posted: Mon Feb 04, 2008 11:28 pm Post subject: |
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Hi,
same on my Athlon X2. When it's overclocked the cpu-freq doesn't work. I think that the cpu-freq is getting the information which states are possible directly from a table in the CPU. When the CPU is overclocked the values in the table doesn't fit the values of GHz your CPU is actually running and so the cpu-freq doesn't recognizes the states.
Don't know if this is correct, but it seems logical to me.
WooD |
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adrin n00b
Joined: 27 May 2006 Posts: 41
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Posted: Tue Feb 05, 2008 2:12 pm Post subject: |
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hmm yes i think you are right, it just cannot find correct scaling range or something, is there a way to override it? I think windows deals with freq scaling on OCed CPU quite well. _________________ *a* |
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__jata__ n00b
Joined: 08 Jan 2006 Posts: 10
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Posted: Thu Jun 05, 2008 6:55 pm Post subject: |
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Hi,
same here on E8400: normally it runs at 3.00 GHz and everything is ok. Any attempt to overclock or underclock the processor means automatically impossibility to use any governor (/sys/devices/system/cpu/0,1/cpufreq directories diseappear). Pitty, because this processor is rock stable at 3.30 GHz.
Even worse, I have Q6600 in my other PC (MB Asus P5WDG2 WS Pro) and I cannot find the appropriate settings for the nominal frequency ('default' freq means 2404 MHz instead 2400 MHz, it seems Asus does some kind a slight overclocking by default), and therefore any frequency modification is unavailable at all (under linux). |
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gentoo_ram Guru
Joined: 25 Oct 2007 Posts: 474 Location: San Diego, California USA
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Posted: Thu Jun 05, 2008 9:48 pm Post subject: |
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I have gotten some cpu-freq stuff working on my overclocked E8400. But from what I can tell, it only supports using a 6.0 clock/bus multiplier (low power) and 9.0 clock/bus multiplier (full speed) on my motherboard (ASUS P5N32-E SLI) with the latest BIOS. Under normal clocking, that's 2.0GHz and 3.0 GHz only. When I overclocked, it was 2.4 and 3.6 GHZ. It works under both Windows and Linux. It's a joke compared to my AMD64 machine which offers a variety of frequencies that really save power. I just leave it disabled on my Intel box since it's so useless.
By comparison, my AMD box does:
Code: |
Freq Ticks
1.00 155310397 ( 99.2%)
1.80 460840 ( 0.3%)
2.00 47006 ( 0.0%)
2.20 29394 ( 0.0%)
2.40 30871 ( 0.0%)
2.60 21943 ( 0.0%)
2.80 20605 ( 0.0%)
3.00 661526 ( 0.4%)
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shredder n00b
Joined: 22 Nov 2004 Posts: 47
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Posted: Fri Jun 06, 2008 10:33 pm Post subject: |
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Gentoo_ram's mobo is from ASUS, but you others may have a Gigabyte. http://www.phoronix.com/forums/showthread.php?p=34150
Possible that applying BIOS updates for ASUS mobos solves the problem too.
Maybe it is possible to manipulate cpufreq settings under: /sys/devices/system/cpu/cpu*/cpufreq/ |
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adrin n00b
Joined: 27 May 2006 Posts: 41
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Posted: Sat Jun 07, 2008 7:57 am Post subject: |
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well i have a gigabyte board, I will upgrade to the latest bios and see if anything improves... _________________ *a* |
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