From: <spaminos-ker@yahoo.com>
To: Jens Axboe <axboe@suse.de>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: cfq misbehaving on 2.6.11-1.14_FC3
Date: Thu, 23 Jun 2005 11:30:51 -0700 (PDT) [thread overview]
Message-ID: <20050623183051.98655.qmail@web30710.mail.mud.yahoo.com> (raw)
In-Reply-To: <20050622204308.GC26925@suse.de>
--- 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.
Nicolas
next prev parent reply other threads:[~2005-06-23 18:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-10 22:54 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 [this message]
2005-06-23 23:33 ` Con Kolivas
2005-06-24 2:33 ` spaminos-ker
2005-06-24 3:27 ` Con Kolivas
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