Re: How how latent should non-preemptive scheduling be?

[Ingo Molnar]

* Sitsofe Wheeler <sitsofe@xxxxxxxxx> 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
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