RE: [Xen-ia64-devel][PATCH] turn on dcr.dm inside XEN

[Alex Williamson <alex.williamson@xxxxxx>]

On Thu, 2007-02-08 at 11:24 +0800, Xu, Anthony wrote:
> Alex Williamson write on 2007å2æ8æ 4:00:
> > Hi Anthony,
> > 
> >    I think I found a bug in this patch.  After saving and restoring a
> > PV domain a few times, I seem to be getting here with
> > v->arch.privregs == NULL.  I'll see if I can figure out why that is,
> > but would appreciate if you could take a look as well.  Thanks,
> 
> Hi Alex,
> 
> I think this is because arch_get_info_guest may be called before privregs
> are allocated.
> 
> I propose we remove dcr from struct vcpu_extra_regs.
> I don't think dcr should be configurable.
> 
> If you agree, I would like to do this patch.

Hi Anthony,

   Ok, lets try it.

> BTW, turning on dcr.dm can gain 5% performance improvement on 
> SPECINT2000, of cause SPECINT2000 is compiled by ICC.

   Great, nice work.  Thanks,

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


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