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Message-ID: <20070311073228.GM943@1wt.eu> Date: Sun, 11 Mar 2007 08:32:28 +0100 From: Willy Tarreau <w@....eu> To: Matt Mackall <mpm@...enic.com> Cc: Con Kolivas <kernel@...ivas.org>, linux-kernel <linux-kernel@...r.kernel.org>, akpm@...l.org Subject: Re: RSDL-mm 0.28 On Sat, Mar 10, 2007 at 07:35:06PM -0600, Matt Mackall wrote: > I've tested -mm2 against -mm2+noyield and -mm2+rsdl+noyield. The > noyield patch simply makes the sched_yield syscall return immediately. > Xorg and all tests are run at nice 0. [skipped long and precise test report] > Also note I could occassionally trigger nasty multi-second pauses with > -mm2+noyield under exectest that didn't show up elsewhere. That's > probably a bug in the mainline scheduler. This is not a bug per se, but more a design problem. This is caused by the interactivity booster which is unfair. Mike Galbraith and others spent a lot of time trying to get rid of those problems a few versions ago. In early kernels (around 2.6.11), I could trivially cause pauses more than 30 seconds long by running a few tasks simulating an interactive workload. It is much more difficult to achieve this with recent kernels, and it has absolutely no effect on RSDL, which is one of the reasons I have to find it great ! Regards, Willy - 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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