linux-kernel - Re: Slow file transfer speeds with CFQ IO scheduler in some cases

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Message-ID: <20081109183043.GA4530@x200.localdomain>
Date:	Sun, 9 Nov 2008 21:30:43 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	"Vitaly V. Bursov" <vitalyb@...enet.dn.ua>
Cc:	linux-kernel@...r.kernel.org, devel@...nvz.org
Subject: Re: Slow file transfer speeds with CFQ IO scheduler in some cases

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@...nvz.org.
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