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Date: Sun, 22 Nov 2009 13:42:09 +0100 From: Ingo Molnar <mingo@...e.hu> To: Alan Cox <alan@...rguk.ukuu.org.uk> Cc: Robert Swan <swan.r.l@...il.com>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org, Arjan van de Ven <arjan@...radead.org> Subject: Re: [bisected] pty performance problem * Alan Cox <alan@...rguk.ukuu.org.uk> wrote: > On Sun, 22 Nov 2009 07:39:26 +0100 > Ingo Molnar <mingo@...e.hu> wrote: > > > > > (Cc:-ed Alan and Linus - mail repeated below. eot.) > > I saw it and replied already. The kernel now queues the work for the > pty as it does normal tty devices. If the CPU load is that low and > nothing else is happening it makes me wonder what the scheduler thinks > it is doing ? Would be nice to see the testcase, but by the looks if it there appears to be a jiffy delay somewhere - not a scheduler delay. On an idle box the scheduler will run any runnable tasks, with no delay. 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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