Re: [RFC PATCH] check_preempt_tick should not compare vruntime with wall time

Linus Torvalds
2010-09-13T17:52:03Z

On Mon, Sep 13, 2010 at 10:45 AM, Mathieu Desnoyers
<mathieu.desnoyers@efficios.com> wrote:
>
> FWIW, Xorg and firefox feel _much more_ responsive with the fix I propose when
> running with a make -j10. The system is even usable with a make -j20 on my UP
> machine, even though I can start feeling a some lag. This is probably a more
> important, yet less scientific, result.

I'll test that myself (but in a bit - I need to go do voter
registration and socsec update first, though - I became a US citizen
last week).

Because yes, that's the reason I'm personally interested in your
scheduler latency work: I think our X behavior under load is pitiful
(I do "make -j16" on my dual-core with HT Core i5, and web browsong
shouldn't start to lag as much as it does just because I overcommit
the CPU a bit). So if this makes a noticeable difference, I think it's
very important.

Linus