linux-kernel - Re: Linux 2.6.29

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Message-ID: <49DA73AE.5020106@rtr.ca>
Date:	Mon, 06 Apr 2009 17:27:10 -0400
From:	Mark Lord <lkml@....ca>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
Cc:	Jeff Moyer <jmoyer@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, tytso@....edu, drees76@...il.com,
	jesper@...gh.cc, linux-kernel@...r.kernel.org,
	jens.axboe@...cle.com
Subject: Re: Linux 2.6.29

Lennart Sorensen wrote:
> On Fri, Apr 03, 2009 at 06:28:36PM -0400, Jeff Moyer wrote:
>> Could you try one more test, please?  Switch back to CFQ and set
>> /sys/block/sdX/queue/iosched/slice_idle to 0?
> 
> I actually am running cfq at the moment, but with Mark's (I think it
> was) preload library to change fsync calls to at most one per 5 seconds
> instead of 10 per second.  So far that has certainly made things a lot
> better as far as I can tell.  Maybe not as good as anticipatory seemed
> to be but certainly better.
> 
> I can try your suggestion too.
..

Yeah, I think the sync_file_range() patch is the way to go.
It seems to be smooth enough here with four or five simultaneous recordings,
a couple of commflaggers, and an HD playback all happening at once.

Cheers
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