Messages in this thread |  | | | From | "Kay, Allen M" <> | | Date | Tue, 6 Oct 2009 13:15:54 -0700 | | Subject | RE: [PATCH ACS v3 1/1] |
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> I was thinking that ACS could be enabled if an IOMMU is enabled. Not a > perfect fit, but seems reasonably close.
Chris, I'm working on a new version of the patch that incorporates iommu check. I'm also adding a check for dom0 kernel as HW iommu is not visible to dom0.
Allen
-----Original Message----- From: Chris Wright [mailto:chrisw@sous-sol.org] Sent: Wednesday, September 30, 2009 6:17 PM To: Kay, Allen M Cc: Chris Wright; linux-kernel@vger.kernel.org; linux-pci@vger.kernel.org; jbarnes@virtuousgeek.org; matthew@wil.cx Subject: Re: [PATCH ACS v3 1/1] * 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
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