Re: 2.6.21-rc1: known regressions (v2) (part 2)

Ingo Molnar
2007-03-01T13:37:56Z

* Con Kolivas <kernel@kolivas.org> wrote:

> [...] Even though I'm finding myself defending code that has already
> been softly tagged for redundancy, let's be clear here; we're talking
> about at most a further 70ms delay in scheduling a niced task in the
> presence of a nice 0 task, which is a reasonable delay for ksoftirqd
> which we nice the eyeballs out of in mainline. Considering under load
> our scheduler has been known to cause scheduling delays of 10 seconds
> I still don't see this as a bug. Dynticks just "points it out to us".

well, not running softirqs when we could is a bug. It's not a big bug,
but it's a bug nevertheless. It doesnt matter that softirqs could be
delayed even worse under high load - there was no 'high load' here.

Ingo