On Fri, 2005-07-22 at 20:31 -0700, Linus Torvalds wrote:
>
> On Fri, 22 Jul 2005, Lee Revell wrote:
> >
> > Con's interactivity benchmark looks quite promising for finding
> > scheduler related interactivity regressions.
>
> I doubt that _any_ of the regressions that are user-visible are
> scheduler-related. They all tend to be disk IO issues (bad scheduling or
> just plain bad drivers), and then sometimes just VM misbehaviour.
>
> People are looking at all these RT patches, when the thing is that most
> nobody will ever be able to tell the difference between 10us and 1ms
> latencies unless it causes a skip in audio.
I agree re: the RT patches, but what makes Con's benchmark useful is
that it also tests interactivity (measuring in msecs vs. usecs) with
everything running SCHED_NORMAL, which is a much better approximation of
a desktop load. And the numbers do go well up into the range where
people would notice, tens and hundreds of ms.
Lee
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