[Xen-users] Xen and XFS, are they good together ?

[Matthieu Patou <mat+Informatique.xen@xxxxxxxxx>]

I am running a test campain on a fairly recent Xen (3.3), and found some 
problems with XFS.
I run bonnie++, iozone and dbench on Ubuntu 8.10 (in order to have a 
recent Xen package) with a 2.6.24 kernel (from Ubuntu 8.04) with and 
without xen on a quad core Xeon 1gig of ram (to limit the time spent 
with iozone and bonnie) and 2 array of 2 RAID1 SATA disks  connected to 
a LSI 1068e controller.
Tests with bonnie and iozone shows that results are quite similar but 
with dbench I get a 10/20MB penalty when running Xen.
The thing is that bonnie and iozone are using a few file and doing I/O 
in it and reflect the capacity (to my mind) of the FS to fetch/write 
blocks from/to the disks in the most efficient way (could it be either 
in a sequential or random mode). Dbench represent a more "real world" 
usage, or at least a different approach which different concurrent process.
Dbench is more metadata intensive, but is there a reason that this 
metadata operations perform worse in Xen that on bare metal linux ?
Is there anybody running XFS with Xen ? have you noticed something ?

Matthieu.

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