linux-kernel - Re: [PATCH ACS v3 1/1]

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Message-ID: <20091005171419.5464502d@jbarnes-g45>
Date:	Mon, 5 Oct 2009 17:14:19 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	"Kay, Allen M" <allen.m.kay@...el.com>,
	Chris Wright <chrisw@...s-sol.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"matthew@....cx" <matthew@....cx>
Subject: Re: [PATCH ACS v3 1/1]

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

> * Kay, Allen M (allen.m.kay@...el.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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