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Date: Sun, 3 Feb 2008 16:32:55 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Toralf Förster <toralf.foerster@....de> Cc: linux-kernel@...r.kernel.org, cpufreq@....linux.org.uk Subject: Re: (ondemand) CPU governor regression between 2.6.23 and 2.6.24 On Sat, 26 Jan 2008 15:06:25 +0100 Toralf Förster <toralf.foerster@....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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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