Messages in this thread | | | Date | Sun, 3 Feb 2008 16:32:55 -0800 | From | Andrew Morton <> | Subject | Re: (ondemand) CPU governor regression between 2.6.23 and 2.6.24 |
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On Sat, 26 Jan 2008 15:06:25 +0100 Toralf Förster <toralf.foerster@gmx.de> wrote:
> I use a 1-liner for a simple performance check : "time factor 819734028463158891" > Here is the result for the new (Gentoo) kernel 2.6.24: > > With the ondemand governor of the I get: > > tfoerste@n22 ~/tmp $ time factor 819734028463158891 > 819734028463158891: 3 273244676154386297 > > real 0m32.997s > user 0m15.732s > sys 0m0.014s > > With the ondemand governor the CPU runs at 600 MHz, > whereas with the performance governor I get : > > tfoerste@n22 ~/tmp $ time factor 819734028463158891 > 819734028463158891: 3 273244676154386297 > > real 0m10.893s > user 0m5.444s > sys 0m0.000s > > (~5.5 sec as I expected) b/c the CPU is set to 1.7 GHz. > > The ondeman governor of previous kernel versions however automatically increased > the CPU speed from 600 MHz to 1.7 GHz. > > My system is a ThinkPad T41, I'll attach the .config >
Let's cc the cpufreq list.
If nothing happens (often the case), please raise a report at bugzilla.kernel.org so we can track the presence of the regression.
Thanks.
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