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Date: Tue, 30 Sep 2008 13:22:41 +0200 From: Ingo Molnar <mingo@...e.hu> To: Sitsofe Wheeler <sitsofe@...oo.com> Cc: linux-kernel@...r.kernel.org, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Arjan van de Ven <arjan@...radead.org>, Steven Rostedt <rostedt@...dmis.org> Subject: Re: How how latent should non-preemptive scheduling be? * Sitsofe Wheeler <sitsofe@...oo.com> wrote: > cat-7717 [000] 1392.941867: __tasklet_schedule <-ath5k_intr > cat-7717 [000] 1393.005963: __tasklet_schedule <-ath5k_intr > cat-7717 [000] 1393.033222: __switch_to <-schedule > > Here a schedule seemingly doesn't happen for a few hundredths of a second... that's about 60 msecs. ath5k_intr IRQ handling overhead? IRQ handlers are non-preemptible. (even under CONFIG_PREEMPT=y) 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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