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SubjectRE: [PATCH ACS v3 1/1]
Jesse,

I will send you a replacement patch since the size of the patch is not so big.

Allen

-----Original Message-----
From: Jesse Barnes [mailto:jbarnes@virtuousgeek.org]
Sent: Monday, October 05, 2009 5:14 PM
To: Chris Wright
Cc: Kay, Allen M; Chris Wright; linux-kernel@vger.kernel.org; linux-pci@vger.kernel.org; matthew@wil.cx
Subject: Re: [PATCH ACS v3 1/1]
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


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