Fedora 9 multicore performance Q9300

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Henri Ala-Peijari

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Message 756980 - Posted: 22 May 2008, 20:31:50 UTC

I wonder if anyone else has noticed that Fedora 9 seems to scale CPU's to 80% when running background processes such as BOINC/SETI. I wonder if this is the case with other Linux distributions as well? I have the 64bit version of Fedora 9 and I got about 5500 integer MIPS but when I tweaked with the CPU/Core settings I got about 6900MIPS/core. Floating point MIPS were not affected and were about 2500MIPS. I notice that SETI calculations benefited significantly after I used the CPU frequency scaling monitor (an add-to-panel application). I had to put 4 copies of this application to my panel on Fedora9 because the Q9300 has four cores and each one is controlled separately.

I filed a bug report against Fedora 9
https://bugzilla.redhat.com/show_bug.cgi?id=447975
And they kindly pointed out that the command
echo 0 > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/ignore_nice_load
will also do the job.

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Profile [KWSN]John Galt 007
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Message 756988 - Posted: 22 May 2008, 20:53:13 UTC

Check your BIOS if the Intel Enhanced Speedstep Technology is enabled. If so, it will scale your CPU back in Linux. I noticed this with Ubuntu, and disabled it in the BIOS, and only then did my Q9300 run at full speed.
Clk2HlpSetiCty:::PayIt4ward

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Message boards : Number crunching : Fedora 9 multicore performance Q9300


 
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