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

[Brock Palen <brockp@xxxxxxxxx>]

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
>
>
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