From: "Yang, Sheng" <sheng.yang@intel.com>
To: lidong chen <chen.lidong.kernel@gmail.com>
Cc: Avi Kivity <avi@redhat.com>, Gleb Natapov <gleb@redhat.com>,
"mst@redhat.com" <mst@redhat.com>,
"aliguori@us.ibm.com" <aliguori@us.ibm.com>,
"rusty@rustcorp.com.au" <rusty@rustcorp.com.au>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: Performance test result between virtio_pci MSI-X disable and enable
Date: Tue, 30 Nov 2010 17:24:16 +0800 [thread overview]
Message-ID: <201011301724.16896.sheng.yang@intel.com> (raw)
In-Reply-To: <AANLkTi=j14t0cY3m+gTZAONBtp1tsVhWpNLXgP9-ikFp@mail.gmail.com>
On Tuesday 30 November 2010 17:10:11 lidong chen wrote:
> sr-iov also meet this problem, MSIX mask waste a lot of cpu resource.
>
> I test kvm with sriov, which the vf driver could not disable msix.
> so the host os waste a lot of cpu. cpu rate of host os is 90%.
>
> then I test xen with sriov, there ara also a lot of vm exits caused by
> MSIX mask.
> but the cpu rate of xen and domain0 is less than kvm. cpu rate of xen
> and domain0 is 60%.
>
> without sr-iov, the cpu rate of xen and domain0 is higher than kvm.
>
> so i think the problem is kvm waste more cpu resource to deal with MSIX
> mask. and we can see how xen deal with MSIX mask.
>
> if this problem sloved, maybe with MSIX enabled, the performace is better.
Please refer to my posted patches for this issue.
http://www.spinics.net/lists/kvm/msg44992.html
--
regards
Yang, Sheng
>
> 2010/11/23 Avi Kivity <avi@redhat.com>:
> > On 11/23/2010 09:27 AM, lidong chen wrote:
> >> can you tell me something about this problem.
> >> thanks.
> >
> > Which problem?
> >
> > --
> > I have a truly marvellous patch that fixes the bug which this
> > signature is too narrow to contain.
next prev parent reply other threads:[~2010-11-30 9:22 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-23 2:53 Performance test result between virtio_pci MSI-X disable and enable lidong chen
2010-11-23 6:20 ` Avi Kivity
2010-11-23 6:42 ` Gleb Natapov
2010-11-23 7:27 ` lidong chen
2010-11-23 7:39 ` Avi Kivity
2010-11-30 9:10 ` lidong chen
2010-11-30 9:24 ` Yang, Sheng [this message]
2010-12-01 8:41 ` lidong chen
2010-12-01 8:49 ` Yang, Sheng
2010-12-01 8:54 ` lidong chen
2010-12-01 9:02 ` Yang, Sheng
2010-12-01 9:29 ` lidong chen
2010-12-01 9:37 ` Yang, Sheng
2010-12-01 9:34 ` Yang, Sheng
2010-12-01 8:56 ` Yang, Sheng
2010-12-01 14:03 ` Michael S. Tsirkin
2010-12-02 1:13 ` Yang, Sheng
2010-12-02 9:49 ` Michael S. Tsirkin
2010-12-02 11:52 ` Sheng Yang
2010-12-02 12:23 ` Michael S. Tsirkin
2010-12-02 14:01 ` lidong chen
2010-12-22 13:52 ` Michael S. Tsirkin
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