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
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