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Message-ID: <20070801122308.GA25429@elte.hu> Date: Wed, 1 Aug 2007 14:23:08 +0200 From: Ingo Molnar <mingo@...e.hu> To: Roman Zippel <zippel@...ux-m68k.org> Cc: Mike Galbraith <efault@....de>, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org Subject: Re: CFS review * Roman Zippel <zippel@...ux-m68k.org> wrote: > On Wed, 1 Aug 2007, Ingo Molnar wrote: > > > > [...] e.g. in this example there are three tasks that run only for > > > about 1ms every 3ms, but they get far more time than should have > > > gotten fairly: > > > > > > 4544 roman 20 0 1796 520 432 S 32.1 0.4 0:21.08 lt > > > 4545 roman 20 0 1796 344 256 R 32.1 0.3 0:21.07 lt > > > 4546 roman 20 0 1796 344 256 R 31.7 0.3 0:21.07 lt > > > 4547 roman 20 0 1532 272 216 R 3.3 0.2 0:01.94 l > > > > Mike and me have managed to reproduce similarly looking 'top' output, > > but it takes some effort: we had to deliberately run a non-TSC > > sched_clock(), CONFIG_HZ=100, !CONFIG_NO_HZ and !CONFIG_HIGH_RES_TIMERS. > > I used my old laptop for these tests, where tsc is indeed disabled due > to instability. Otherwise the kernel was configured with > CONFIG_HZ=1000. please send all the debug info and source code we asked for - thanks! Ingo - 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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