From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [PATCH 05/13] KVM: Update IRTE according to guest interrupt configuration changes Date: Wed, 12 Nov 2014 10:56:26 +0100 Message-ID: <54632ECA.4070903@redhat.com> References: <5461EC99.1000101@redhat.com> <546324F4.8010002@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: "kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "gleb-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org" , "x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org" , "mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org" , "hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org" , "tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org" , "dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org" To: "Wu, Feng" , "Zhang, Yang Z" , Alex Williamson Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org List-Id: kvm.vger.kernel.org On 12/11/2014 10:19, Wu, Feng wrote: >> You can certainly backport these patches to distros that do not have >> VFIO. But upstream we should work on VFIO first. VFIO has feature >> parity with legacy device assignment, and adding a new feature that is >> not in VFIO would be a bad idea. >> >> By the way, do you have benchmark results for it? We have not been able >> to see any performance improvement for APICv on e.g. netperf. > > Do you mean benchmark results for APICv itself or VT-d Posted-Interrtups? Especially for VT-d posted interrupts---but it'd be great to know which workloads see the biggest speedup from APICv. Paolo