[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC PATCH 0/9] Introduce AMD SVM AVIC
Boris, On 9/20/16 21:34, Boris Ostrovsky wrote: BENCHMARK 1: HACKBENCH > ====================== > > For measuring IPI performance used for scheduling workload, I have collected > some performance number on 2 and 3 CPU running hackbech with the following > detail: > > hackbench -p -l 100000 > Running in process mode with 10 groups using 40 file descriptors each (== 400 tasks) > Each sender will pass 100000 messages of 100 bytes > > | 2 vcpus (sec) | 3 vcpus (sec) > -------------------------------------------------------- > No AVIC w/o evtchn | 299.57 | 337.779 > No AVIC w/ evtchn | 270.37 | 419.6064 > AVIC w/ evtchn | 181.46 | 171.7957 > AVIC w/o evtchn | 171.81 | 169.0858 > > Note: In "w/o evtchn" case, the Linux guest is built w/o > Xen guest support.Enlightened Linux tries to avoid using event channels for APIC accesses if XEN_HVM_CPUID_APIC_ACCESS_VIRT or XEN_HVM_CPUID_X2APIC_VIRT is set. I didn't notice either of these two bits set in the series. Should they be (probably the first one)? Or is this something you are planning for the second part? -boris Thanks for pointing this out. The XEN_HVM_CPUID_APIC_ACCESS_VIRT would likely be needed. Since it is related to MSI, this will be covered in the second part of this patch series. Thanks, Suravee _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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