linux-kernel - Re: Poor interactive performance with I/O loads with fsync()ing

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Message-ID: <4bac2726.017ee70a.188b.1305@mx.google.com>
Date:	Thu, 25 Mar 2010 20:16:54 -0700 (PDT)
From:	Ben Gamari <bgamari.foss@...il.com>
To:	tytso@....edu
Cc:	linux-kernel@...r.kernel.org, Olly Betts <olly@...vex.com>,
	martin f krafft <madduck@...duck.net>
Subject: Re: Poor interactive performance with I/O loads with fsync()ing

On Tue, 16 Mar 2010 21:31:03 -0700 (PDT), Ben Gamari <bgamari.foss@...il.com> wrote:
> On Tue, 16 Mar 2010 23:30:10 -0400, tytso@....edu wrote:
> > .... so did switching to Btrfs solve your latency issues, or are you
> > still having problems?
> 
> Still having troubles although I'm now running 2.6.34-rc1 and things seem
> mildly better. I'll try doing a backup tonight and report back.
> 
I stand by my assertion that 2.6.34 does seem better in some regards. While
there certainly are still latency issues, it's now less often that heavy I/O
spills over into over processes' interactive performance. That being said,
earlier this evening Tracker and notmuch were both indexing and I saw several
events of tens of seconds of latency.

- Ben
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