RE: [Xen-devel] XenOProfile may have the conflict with SATA AHCI mode.

["Santos, Jose Renato G" <joserenato.santos@xxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ian Pratt
> Sent: Wednesday, April 11, 2007 12:18 PM
> To: Liang Yang; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] XenOProfile may have the conflict 
> with SATA AHCI mode.
> 
> > I notice this issue recently when I'm using XenOProfile with the
> latest
> > Xen-unstable repository. I have several SATA disks to hose several
> guest
> > domains. For the performance purpose, I want to use the 
> on-board AHCI 
> > mode so each SATA disk has its own data transfer channel. 
> However, I 
> > found XenOProfile has some conflict with AHCI mode as Xen will boot 
> > into kernel panic with weird mount errors after XenOProfile is 
> > enabled. The
> problem
> > is
> > gone when I set SATA mode to compatible  in BIOS (i.g. IDE 
> emulation 
> > mode).
> 
> XenOProfile is the only thing that uses NMIs, but I've no 
> idea why that would interfere with the SATA controller.
> 

  I don't know how XenOprofile could be interfering with SATA 
controller either. The only possible explanation I can think
of is that the NMI interrupts are disrupting some time sensitive
code in the SATA driver, but I do not know much about SATA.
Maybe someone more familiar with SATA can comment.

Do you see the same behavior runing Oprofile in vanila linux?
What is the parameters you use to start oprofile?

Renato.

> If you were seing the issue round the other way I'd suspect 
> something dodgy with the BIOS'es SMM mode. Might still be 
> worth checking for a BIOS upgrade.
> 
> Ian
> 
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