[Fedora-xen] Re: Xen issues - Was Xen network performance problem during kickstart.

[Stephen C. Tweedie]

Hi,

On Tue, 2006-02-21 at 02:24 +0900, Naoki wrote:

> On Mon, 2006-02-20 at 12:17 -0500, Stephen C. Tweedie wrote:
> > > kernel BUG at include/asm/xor.h:633!
> > > invalid opcode: 0000 [#1]
> > > SMP
> > > Modules linked in: xor raid1 raid0 xennet sr_mod sd_mod scsi_mod cdrom
> > > squashfs loop nfs nfs_acl lockd sunrpc vfat fat cramfs
> > > CPU:    0
> > 
> > Working fine for me.  Are you using 32- or 64-bit here?  It may be that
> > the 32-bit install is still broken, but 64-bit certainly doesn't show it
> > for me.
> 
> 32-bit kernel, Intel P4 with HT ( hence the SMP kernel ).

OK, will try on 32-bit too.

> I'm doing text. But it's certainly a deeper problem as after install the
> transfer is ten times slower than domain-0. I've tested that with both
> plan wget and with scp transfers.

Out of interest, what happens if you boot without SMP, either by
disabling HT in the bios or giving the hypervisor the "nosmp" boot
option?  There may be a bad HT scheduling performance problem here; it
would be useful to eliminate that possibility.

My own boxes are either pure UP or genuine not-just-HT SMP, which may be
why I don't see this.

--Stephen