Re: A question about HTL VM-Exit handling time

2014-10-28 Thread Paolo Bonzini
On 10/28/2014 12:52 AM, Wanpeng Li wrote: > As you know, kernel build which Feng used is a CPU bound workload, > so why 22.28% samples is halt? Because in a CPU bound workload you don't have many exits in the first place. But there could also be some issues with the way he used perf. 213821 inter

Re: A question about HTL VM-Exit handling time

2014-10-28 Thread Christian Borntraeger
Am 21.10.2014 20:39, schrieb Paolo Bonzini: > > > On 10/16/2014 10:15 AM, Wu, Feng wrote: >> Hi folks, >> >> I run kernel build in the guest and use perf kvm to get some VM-Exit result >> as the following: >> >> Analyze events for all VCPUs: >> >> VM-EXITSamples Samples% Ti

Re: A question about HTL VM-Exit handling time

2014-10-27 Thread Wanpeng Li
Hi Paolo, On Tue, Oct 21, 2014 at 08:39:49PM +0200, Paolo Bonzini wrote: > > >On 10/16/2014 10:15 AM, Wu, Feng wrote: >> Hi folks, >> >> I run kernel build in the guest and use perf kvm to get some VM-Exit result >> as the following: >> >> Analyze events for all VCPUs: >> >> VM-EXI

RE: A question about HTL VM-Exit handling time

2014-10-23 Thread Wu, Feng
> -Original Message- > From: Paolo Bonzini [mailto:pbonz...@redhat.com] > Sent: Thursday, October 23, 2014 8:23 PM > To: Wu, Feng; kvm@vger.kernel.org > Cc: Xiao Guangrong > Subject: Re: A question about HTL VM-Exit handling time > > > > Thanks for your

Re: A question about HTL VM-Exit handling time

2014-10-23 Thread Paolo Bonzini
> Thanks for your answer, Paolo. > There is a general question for perf kvm. Do you know how the vmexit > handling time is measured? Such as what is the start point, and the > end point? If I got this information, I think I can better understand the > value of the handling time. Thanks a lot! It

RE: A question about HTL VM-Exit handling time

2014-10-22 Thread Wu, Feng
> -Original Message- > From: Paolo Bonzini [mailto:paolo.bonz...@gmail.com] On Behalf Of Paolo > Bonzini > Sent: Wednesday, October 22, 2014 2:40 AM > To: Wu, Feng; kvm@vger.kernel.org > Cc: Xiao Guangrong > Subject: Re: A question about HTL VM-Exit handling time >

Re: A question about HTL VM-Exit handling time

2014-10-21 Thread Paolo Bonzini
On 10/16/2014 10:15 AM, Wu, Feng wrote: > Hi folks, > > I run kernel build in the guest and use perf kvm to get some VM-Exit result > as the following: > > Analyze events for all VCPUs: > > VM-EXITSamples Samples% Time% Min Time Max Time > A > >

A question about HTL VM-Exit handling time

2014-10-16 Thread Wu, Feng
Hi folks, I run kernel build in the guest and use perf kvm to get some VM-Exit result as the following: Analyze events for all VCPUs: VM-EXITSamples Samples% Time% Min Time Max Time A MSR_WRITE361390857.53%18.97%5us 1362us