Cui, Dexuan
2006-Oct-30 07:02 UTC
RE: [Xen-devel] [Patch][RESEND] Add hardware CR8 acceleration for TPRaccessing
Any advice about the patch cr8-acceleration-3.patch? Hi Keir, could you give some comments? Thanks! -- Dexuan -----Original Message----- From: xen-devel-bounces@lists.xensource.com [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Cui, Dexuan Sent: 2006年10月25日 11:12 To: Keir.Fraser@cl.cam.ac.uk Cc: xen-devel@lists.xensource.com Subject: [Xen-devel] [Patch][RESEND] Add hardware CR8 acceleration for TPRaccessing x64 Windows uses CR8 to access TPR very frequently. This patch enables TPR shadow and allows mov-from/to-CR8 to access it directly; tests indicates it can boost greatly the performance of x64 Windows 2003. Thanks -- Dexuan Signed-off-by: Eddie Dong <eddie.dong@intel.com> Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com> Signed-off-by: Dexuan Cui <dexuan.cui@intel.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Keir Fraser
2006-Oct-30 10:39 UTC
Re: [Xen-devel] [Patch][RESEND] Add hardware CR8 acceleration for TPRaccessing
Why set the TPR threshold to non-zero when current TPR is less than highest IRR? The TPR is not gating injection of the interrupt, so why would we care if its value becomes even smaller -- it''s already small enough? Couldn''t we have if (highest_irr == -1) || (highest_irr > tpr) TPR_thresh=0 else TPR_thresh = highest_irr>>4 -- Keir On 30/10/06 07:02, "Cui, Dexuan" <dexuan.cui@intel.com> wrote:> Any advice about the patch cr8-acceleration-3.patch? > Hi Keir, could you give some comments? Thanks! > -- Dexuan > > -----Original Message----- > From: xen-devel-bounces@lists.xensource.com > [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Cui, Dexuan > Sent: 2006年10月25日 11:12 > To: Keir.Fraser@cl.cam.ac.uk > Cc: xen-devel@lists.xensource.com > Subject: [Xen-devel] [Patch][RESEND] Add hardware CR8 acceleration for > TPRaccessing > > x64 Windows uses CR8 to access TPR very frequently. This patch enables > TPR shadow and allows mov-from/to-CR8 to access it directly; tests > indicates it can boost greatly the performance of x64 Windows 2003. > > Thanks > -- Dexuan > > Signed-off-by: Eddie Dong <eddie.dong@intel.com> > Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com> > Signed-off-by: Dexuan Cui <dexuan.cui@intel.com> > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
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