RE: [Xen-users] Exporting a PCI Device

["Joris Dobbelsteen" <Joris@xxxxxxxxxxxxxxxxxxxxx>]

>-----Original Message-----
>From: Jan Kalcic [mailto:jandot@xxxxxxxxxxxxxx] 
>Sent: Monday, 18 February 2008 23:44
>To: Joris Dobbelsteen
>Cc: deshantm@xxxxxxxxx; xen-users@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-users] Exporting a PCI Device
>
[snip]
>
>I did some test and actually it's quite slow both in reading 
>and in writing. Roughly 50% as Block Device attacched to the domU.
>It reduces complexity but too much is lost in performance.

For some odd reason I'm seeing a similar things on my box with attached
RAID-0 & LVM. The domU only reaches 50%. I don't know the cause, I only
heared comments that it had todo with LVM oddities that RAID seemed to
aggrivate. Nevertheless the dom0 reaches full speed.

Coincidence or a sign of deeper trouble?

My setup is just some standard (cheap) SATA disks, it's a personal
system. It does run Xen 3.1.2, the 2.6.20 kernel on the domU and the
Debian Etch 2.6.18 kernels on the guests. Tests where with Bonnie++
(that's part of debian etch).

To rule out the virtual block device playing tricks I would try to see
what happens with a slower disk on the SAN and even with a local disk
(in the system itself).

- Joris


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