linux-kernel - Re: Linux 2.6.29

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Date:	Thu, 2 Apr 2009 21:13:19 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Jens Axboe <jens.axboe@...cle.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>, tytso@....edu,
	drees76@...il.com, jesper@...gh.cc,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29


Jens - remind us what the problem with AS was wrt CFQ?

There's some write throttling in CFQ, maybe it has some really broken 
case?

		Linus

On Fri, 3 Apr 2009, Lennart Sorensen wrote:

> On Thu, Apr 02, 2009 at 03:00:44AM +0200, Ingo Molnar wrote:
> > I'll test this (and the other suggestions) once i'm out of the merge 
> > window.
> > 
> > I probably wont test that though ;-)
> > 
> > Going back to v2.6.14 to do pre-mutex-merge performance tests was 
> > already quite a challenge on modern hardware.
> 
> Well after a day of running my mythtv box with anticipatiry rather than
> the default cfq scheduler, it certainly looks a lot better.  I haven't
> seen any slowdowns, the disk activity light isn't on solidly (it just
> flashes every couple of seconds instead), and it doesn't even mind
> me lanuching bittornado on multiple torrents at the same time as two
> recordings are taking place and some commercial flagging is taking place.
> With cfq this would usually make the system unusable (and a Q6600 with
> 6GB ram should never be unresponsive in my opinion).
> 
> So so far I would rank anticipatory at about 1000x better than cfq for
> my work load.  It sure acts a lot more like it used to back in 2.6.18
> times.
> 
> -- 
> Len Sorensen
> 
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