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From: Chris Wright <chrisw@sous-sol.org>
To: "Kay, Allen M" <allen.m.kay@intel.com>
Cc: Chris Wright <chrisw@sous-sol.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"jbarnes@virtuousgeek.org" <jbarnes@virtuousgeek.org>,
	"matthew@wil.cx" <matthew@wil.cx>
Subject: Re: [PATCH ACS v3 1/1]
Date: Wed, 30 Sep 2009 18:17:21 -0700	[thread overview]
Message-ID: <20091001011721.GK3958@sequoia.sous-sol.org> (raw)
In-Reply-To: <57C9024A16AD2D4C97DC78E552063EA3E2F0411F@orsmsx505.amr.corp.intel.com>

* 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.

thanks,
-chris

  reply	other threads:[~2009-10-01  1:17 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-17 23:46 Allen Kay
2009-09-29  0:00 ` Chris Wright
2009-09-29 17:46   ` Kay, Allen M
2009-09-29 18:46     ` Chris Wright
2009-09-30 23:33       ` Kay, Allen M
2009-10-01  1:17         ` Chris Wright [this message]
2009-10-06  0:14           ` Jesse Barnes
2009-10-06  0:29             ` Kay, Allen M
2009-10-06 20:15           ` Kay, Allen M

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