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xen-devel
Re: [Xen-devel] extremely slow disk access
> Hi list members,
>
> I have a fresh FC3 with fresh bk clone of xen-2.0.bk. It builds and
> installs without complaint.
>
> "/lib/tls" has been moved to "/lib/tls.disabled".
>
> 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?
>
> 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?
Looks like you're falling back to PIO mode under Xen.
Have you compiled in support for your IDE chipset?
cheers,
S.
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