Re: [Xen-users] Xen hard-disk performance regression?

["Olivier B." <xen.list@xxxxxxxxx>]

Hi,

Are you using LVM ? Barriers was implemented on LVM in recent versions, 
which can probably explain some performance regressions like this.
Olivier

On 11/04/2010 21:44, Fabiano Francesconi wrote:
> Ok, confirmed. The problem is only visible when copying files so it's
> not something related to the hard-disk itself.
>
> I sincerely don't know how to dig into this but I have made some tests
> myself.
>
> I've tried copying a single avi file (350mb) from one partition to
> another one. Both partition are on the same device (WDC WD10EADS-00M2B0)
> and both formatted in XFS filesystem.
>
> Running 2.6.32-xen-r1 I have the following output:
>
> real    1m35.001s
> user    0m0.016s
> sys     0m0.722s
>
> Running 2.6.29-xen-r4 I have, instead, the following output:
>
> real    0m20.689s
> user    0m0.018s
> sys     0m2.047s
>
> How can I see such a difference? Is there some known regression for XFS
> filesystem? I might try to run a vanilla kernel instead of a xen-patched
> one.
>
> Any suggestion will be very much appreciated.
>
>    
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