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

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Date:	Sun, 09 Nov 2008 20:32:08 +0200
From:	"Vitaly V. Bursov" <vitalyb@...enet.dn.ua>
To:	Alexey Dobriyan <adobriyan@...il.com>
CC:	linux-kernel@...r.kernel.org, devel@...nvz.org
Subject: Re: Slow file transfer speeds with CFQ IO scheduler in some cases

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@...nvz.org.

That's why I've checked vanilla kernel also. It performs somewhat better,
but definitely shares same issues...

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