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xen-devel
RE: [Xen-devel] extremely slow disk access
> My understanding is that in a stand-alone (no vms running)
> situation the
> performance difference between a standard kernel and a xen enabled
> kernel should be roughly the same. Is this correct?
Yes. Xen is clearly very unhappy on your system.
Are you sure the correct ide driver is compiled into the kernel and is
being used? Compare the boot messages between native and booting the xen
kernel.
Ian
> 2.6.10-xen0 boots with no errors, but the mouse seems jerky
> and slow to
> respond but is functional.
>
> Networking is up and functional.
>
> The drives are IDE in a raid0 using lvm. The m/b is typical
> budget x86
> with 1GB ram and 1GHz Athlon. It has been in various uses without
> failure for a couple years.
>
> As a test I created a logical volume "Main/test" of 1G rw and
> formatted
> it with ext3. The inode creation part took perhaps 1 second but the
> journal creation took over 1 minute. I was able to have
> lunch (and do
> the dishes) in the time it took to format 18G.
>
> Reboot into 2.6.9 non-xen and try the same experiment and the entire
> process takes less than 2 seconds.
>
> I looked in /proc/interrupts but nothing there seems awry, i.e. no
> runaway counts.
>
> Does anyone have any idea what may be wrong or where I should
> look next?
>
> Thanks for any help,
> Mike Wright
>
>
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