Re: [PATCH ACS v3 1/1]

[Jesse Barnes <jbarnes@virtuousgeek.org>]

On Wed, 30 Sep 2009 18:17:21 -0700
Chris Wright <chrisw@sous-sol.org> wrote:

> * Kay, Allen M (allen.m.kay@intel.com) wrote:
> > On the other hand, can we say VT-d PT mode is mainly for KVM
> > virtualization use case?  If so, is it reasonable to say
> > performance of host P2P in this mode is not of highest priority?
> 
> Guess it depends on the workload.  Would be helpful to identify a use
> case that is p2p heavy (and then the impact of enabling ACS).
> 
> > If not, another option is to have a kernel boot parameter to
> > configure an kernel boot instance to be either host kernel
> > optimized or virtualization optimized.  I don't know whether this
> > is a reasonable or not ...
> 
> I was thinking that ACS could be enabled if an IOMMU is enabled.  Not
> a perfect fit, but seems reasonably close.

Allen, did you want to do these changes as an incremental patch on your
last one or just send me a replacement?  Either way is fine with me.

-- 
Jesse Barnes, Intel Open Source Technology Center