From: Jens Axboe <jens.axboe@oracle.com>
To: "Vitaly V. Bursov" <vitalyb@telenet.dn.ua>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Slow file transfer speeds with CFQ IO scheduler in some cases
Date: Mon, 10 Nov 2008 11:44:24 +0100 [thread overview]
Message-ID: <20081110104423.GA26778@kernel.dk> (raw)
In-Reply-To: <4917263D.2090904@telenet.dn.ua>
On Sun, Nov 09 2008, Vitaly V. Bursov wrote:
> Hello,
>
> I'm building small server system with openvz kernel and have ran into
> some IO performance problems. Reading a single file via NFS delivers
> around 9 MB/s over gigabit network, but while reading, say, 2 different
> or same file 2 times at the same time I get >60MB/s.
>
> Changing IO scheduler to deadline or anticipatory fixes problem.
>
> Tested kernels:
> OpenVZ RHEL5 028stab059.3 (9 MB/s with HZ=100, 20MB/s with HZ=1000
> fast local reads)
> Vanilla 2.6.27.5 (40 MB/s with HZ=100, slow local reads)
>
> Vanilla performs better in worst case but I believe 40 is still low
> concerning test results below.
Can you check with this patch applied?
http://bugzilla.kernel.org/attachment.cgi?id=18473&action=view
--
Jens Axboe
next prev parent reply other threads:[~2008-11-10 10:46 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-09 18:04 Slow file transfer speeds with CFQ IO scheduler in some cases Vitaly V. Bursov
2008-11-09 18:30 ` Alexey Dobriyan
2008-11-09 18:32 ` Vitaly V. Bursov
2008-11-10 10:44 ` Jens Axboe [this message]
2008-11-10 13:51 ` Jeff Moyer
2008-11-10 13:56 ` Jens Axboe
2008-11-10 17:16 ` Vitaly V. Bursov
2008-11-10 17:35 ` Jens Axboe
2008-11-10 18:27 ` Vitaly V. Bursov
2008-11-10 18:29 ` Jens Axboe
2008-11-10 18:39 ` Jeff Moyer
2008-11-10 18:42 ` Jens Axboe
2008-11-10 21:51 ` Jeff Moyer
2008-11-11 9:34 ` Jens Axboe
2008-11-11 9:35 ` Jens Axboe
2008-11-11 11:52 ` Jens Axboe
2008-11-11 16:48 ` Jeff Moyer
2008-11-11 18:08 ` Jens Axboe
2008-11-11 16:53 ` Vitaly V. Bursov
2008-11-11 18:06 ` Jens Axboe
2008-11-11 19:36 ` Jeff Moyer
2008-11-11 21:41 ` Jeff Layton
2008-11-11 21:59 ` Jeff Layton
2008-11-12 12:20 ` Jens Axboe
2008-11-12 12:45 ` Jeff Layton
2008-11-12 12:54 ` Christoph Hellwig
2008-11-11 19:42 ` Vitaly V. Bursov
2008-11-12 18:32 ` Jeff Moyer
2008-11-12 19:02 ` Jens Axboe
2008-11-13 8:51 ` Wu Fengguang
2008-11-13 8:54 ` Jens Axboe
2008-11-14 1:36 ` Wu Fengguang
2008-11-25 11:02 ` Vladislav Bolkhovitin
2008-11-25 11:25 ` Wu Fengguang
2008-11-25 15:21 ` Jeff Moyer
2008-11-25 16:17 ` Vladislav Bolkhovitin
2008-11-13 18:46 ` Vitaly V. Bursov
2008-11-25 10:59 ` Vladislav Bolkhovitin
2008-11-25 11:30 ` Wu Fengguang
2008-11-25 11:41 ` Vladislav Bolkhovitin
2008-11-25 11:49 ` Wu Fengguang
2008-11-25 12:03 ` Vladislav Bolkhovitin
2008-11-25 12:09 ` Vladislav Bolkhovitin
2008-11-25 12:15 ` Wu Fengguang
2008-11-27 17:46 ` Vladislav Bolkhovitin
2008-11-28 0:48 ` Wu Fengguang
2009-02-12 18:35 ` Vladislav Bolkhovitin
2009-02-13 1:57 ` Wu Fengguang
2009-02-13 20:08 ` Vladislav Bolkhovitin
2009-02-16 2:34 ` Wu Fengguang
2009-02-17 19:03 ` Vladislav Bolkhovitin
2009-02-18 18:14 ` Vladislav Bolkhovitin
2009-02-19 1:35 ` Wu Fengguang
2009-02-17 19:01 ` Vladislav Bolkhovitin
2009-02-19 2:05 ` Wu Fengguang
2009-03-19 17:44 ` Vladislav Bolkhovitin
2009-03-20 8:53 ` Vladislav Bolkhovitin
2009-03-23 1:42 ` Wu Fengguang
2009-04-21 18:18 ` Vladislav Bolkhovitin
2009-04-24 8:43 ` Wu Fengguang
2009-05-12 18:13 ` Vladislav Bolkhovitin
2009-02-17 19:01 ` Vladislav Bolkhovitin
2009-02-19 1:38 ` Wu Fengguang
2008-11-24 15:33 ` Jeff Moyer
2008-11-24 18:13 ` Jens Axboe
2008-11-24 18:50 ` Jeff Moyer
2008-11-24 18:51 ` Jens Axboe
2008-11-13 6:54 ` Vitaly V. Bursov
2008-11-13 14:32 ` Jeff Moyer
2008-11-13 18:33 ` Vitaly V. Bursov
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