From: Con Kolivas <kernel@kolivas.org>
To: linux-kernel@vger.kernel.org, spaminos-ker@yahoo.com
Cc: Jens Axboe <axboe@suse.de>, Andrew Morton <akpm@osdl.org>
Subject: Re: cfq misbehaving on 2.6.11-1.14_FC3
Date: Fri, 24 Jun 2005 09:33:53 +1000 [thread overview]
Message-ID: <200506240933.55951.kernel@kolivas.org> (raw)
In-Reply-To: <20050623183051.98655.qmail@web30710.mail.mud.yahoo.com>
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On Fri, 24 Jun 2005 04:30, spaminos-ker@yahoo.com wrote:
> --- Jens Axboe <axboe@suse.de> wrote:
> > Journalled file systems will behave worse for this, because it has to
> > tend to the journal as well. Can you try mounting that partition as ext2
> > and see what numbers that gives you?
>
> I did the tests again on a partition that I could mkfs/mount at will.
>
> On ext3, I get about 33 seconds average latency.
>
> And on ext2, as predicted, I have latencies in average of about 0.4
> seconds.
>
> I also tried reiserfs, and it gets about 22 seconds latency.
>
> As you pointed out, it seems that there is a flow in the way IO queues and
> journals (that are in some ways queues as well), interact in the presence
> of flushes.
I found the same, and the effect was blunted by noatime and
journal_data_writeback (on ext3). Try them one at a time and see what you
get.
Cheers,
Con
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next prev parent reply other threads:[~2005-06-23 23:34 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-10 22:54 cfq misbehaving on 2.6.11-1.14_FC3 spaminos-ker
2005-06-11 9:29 ` Andrew Morton
2005-06-14 2:19 ` spaminos-ker
2005-06-14 7:03 ` Andrew Morton
2005-06-14 23:21 ` spaminos-ker
2005-06-17 14:10 ` Jens Axboe
2005-06-17 15:51 ` Andrea Arcangeli
2005-06-17 18:16 ` Jens Axboe
2005-06-17 23:01 ` spaminos-ker
2005-06-22 9:24 ` Jens Axboe
2005-06-22 17:54 ` spaminos-ker
2005-06-22 20:43 ` Jens Axboe
2005-06-23 18:30 ` spaminos-ker
2005-06-23 23:33 ` Con Kolivas [this message]
2005-06-24 2:33 ` spaminos-ker
2005-06-24 3:27 ` Con Kolivas
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