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Re: [Xen-devel] extremely slow disk access

To: Xen User <xen@xxxxxxxxxx>
Subject: Re: [Xen-devel] extremely slow disk access
From: Steven Hand <Steven.Hand@xxxxxxxxxxxx>
Date: Fri, 25 Mar 2005 19:07:37 +0000
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> 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? 



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