RE: [Xen-devel] extremely slow disk access

[Ian P. <m+I...@cl...>]

> My understanding is that in a stand-alone (no vms running)=20
> situation the=20
> performance difference between a standard kernel and a xen enabled=20
> kernel should be roughly the same.  Is this correct?

Yes. Xen is clearly very unhappy on your system.=20

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.=20

Ian
=20
> 2.6.10-xen0 boots with no errors, but the mouse seems jerky=20
> and slow to=20
> respond but is functional.
>=20
> Networking is up and functional.
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> The drives are IDE in a raid0 using lvm.  The m/b is typical=20
> budget x86=20
> with 1GB ram and 1GHz Athlon.  It has been in various uses without=20
> failure for a couple years.
>=20
> As a test I created a logical volume "Main/test" of 1G rw and=20
> formatted=20
> it with ext3.  The inode creation part took perhaps 1 second but the=20
> journal creation took over 1 minute.  I was able to have=20
> lunch (and do=20
> the dishes) in the time it took to format 18G.
>=20
> Reboot into 2.6.9 non-xen and try the same experiment and the entire=20
> process takes less than 2 seconds.
>=20
> I looked in /proc/interrupts but nothing there seems awry, i.e. no=20
> runaway counts.
>=20
> Does anyone have any idea what may be wrong or where I should=20
> look next?
>=20
> Thanks for any help,
> Mike Wright
>=20
>=20
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>=20