From: "Vitaly V. Bursov" <vitalyb@telenet.dn.ua>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: linux-kernel@vger.kernel.org, devel@openvz.org
Subject: Re: Slow file transfer speeds with CFQ IO scheduler in some cases
Date: Sun, 09 Nov 2008 20:32:08 +0200 [thread overview]
Message-ID: <49172CA8.5060309@telenet.dn.ua> (raw)
In-Reply-To: <20081109183043.GA4530@x200.localdomain>
Alexey Dobriyan wrote:
> On Sun, Nov 09, 2008 at 08:04:45PM +0200, Vitaly V. Bursov wrote:
>> 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.
>
> openvz kernels have very changed CFQ and, IIRC, this one-reader problem is
> fixed somewhere. Ask devel@openvz.org.
That's why I've checked vanilla kernel also. It performs somewhat better,
but definitely shares same issues...
next prev parent reply other threads:[~2008-11-09 18:32 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-09 18:04 Vitaly V. Bursov
2008-11-09 18:30 ` Alexey Dobriyan
2008-11-09 18:32 ` Vitaly V. Bursov [this message]
2008-11-10 10:44 ` Jens Axboe
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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