Re: [Xen-users] Xen Disk I/O performance vs native performance

To:	"Brock Palen" <brockp@xxxxxxxxx>
Subject:	Re: [Xen-users] Xen Disk I/O performance vs native performance
From:	"Emre Erenoglu" <erenoglu@xxxxxxxxx>
Date:	Fri, 25 Jan 2008 00:58:37 +0100
Cc:	Christophe Clapp <christophe.clapp@xxxxxxxxx>, Sami Dalouche <skoobi@xxxxxxx>, Florent Valdelièvre <Florent.Valdelievre@xxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
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Hi guys, which tool are you using for benchmarking the disks? I used hdparm in the past (-t and -T) and it didn't show much difference.

Emre

On Jan 24, 2008 11:51 PM, Brock Palen < brockp@xxxxxxxxx> wrote:

I see the same drop on my machines, no raid, but do use drbd.
3x's slower

Brock Palen
Center for Advanced Computing
brockp@xxxxxxxxx
(734)936-1985

On Jan 24, 2008, at 5:36 PM, Sami Dalouche wrote:

> Hi,
>
> Can you guys tell me how much slower your Disk I/O performance is
> using
> Xen, compared to native performance ?
>
> On my RAID 5 machine, using Ubuntu feisty's
> linux-ubuntu-modules-2.6.22-14-xen kernel, xen 3.1, LVM disks, read
> and
> writes to the disk are something between 2 and 3 times slower.
>
> Is that considered normal, or especially bad ? If it's worse than the
> average, what kind of information do you want me to give you to
> diagnose
> the problem ?
>
> Thanks for your help,
> Sami Dalouche
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>
>

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Emre Erenoglu
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Re: [Xen-users] Xen Disk I/O performance vs native performance