Re: BFS vs. mainline scheduler benchmarks and measurements

From: Jens Axboe
Date: Mon Sep 07 2009 - 17:05:58 EST

On Mon, Sep 07 2009, Peter Zijlstra wrote:
> On Mon, 2009-09-07 at 22:46 +0200, Jens Axboe wrote:
> > > a bug in the SMP load-balancer that can cause interactivity problems
> > > on large CPU count systems.
> >
> > Worth trying on the dual core box?
> I debugged the issue on a dual core :-)
> It should be more pronounced on larger machines, but its present on
> dual-core too.

Alright, I'll upgrade that box to -tip tomorrow and see if it makes
a noticable difference. At -j4 or higher, I can literally see windows
slowly popping up when switching to a different virtual desktop.

Jens Axboe

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