[Xen-devel] extremely slow disk access

[Xen User <xen@xxxxxxxxxx>]

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?

Thanks for any help,
Mike Wright


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