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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <49172CA8.5060309@telenet.dn.ua>
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...

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/