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

* Sitsofe Wheeler <sitsofe@yahoo.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


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