From: Avi Kivity <avi@redhat.com>
To: "BRAUN, Stefanie" <Stefanie.Braun@alcatel-lucent.de>
Cc: kvm@vger.kernel.org
Subject: Re: AW: AW: AW: KVM performance
Date: Sat, 11 Apr 2009 19:19:23 +0300 [thread overview]
Message-ID: <49E0C30B.1000209@redhat.com> (raw)
In-Reply-To: <133D9897FB9C5E4E9DF2779DC91E947C518355@SLFSNX.rcs.alcatel-research.de>
BRAUN, Stefanie wrote:
> Hello,
>
> now I was able to start the guest vmu with disk virtio, and some of the
> tests with disk involvement even improved a bit.
> But the test in which a logo is added to the video stream does not
> improve. I don't know why the performance is so bad?
>
> Subtest: Reading video locally, adding a logo to the video stream and
> then saving the video locally
> Host performance: 50%
> kvm process in host (top) : 99%
> vlc process in vmu (top) : 99%
>
>
> The output of kvm_stat -1 during the subtest is the following:
>
> efer_reload 0 0
> exits 9913473 3994
>
This indicates that kvm is running in guest mode all of the time and is
therefore quite efficient. Perhaps the test uses sse instructions which
kvm doesn't expose? Try adding -cpu core2duo to the command line.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2009-04-11 16:19 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-03 11:32 KVM performance BRAUN, Stefanie
2009-04-06 11:45 ` Avi Kivity
[not found] ` <133D9897FB9C5E4E9DF2779DC91E947C51834A@SLFSNX.rcs.alcatel-research.de>
[not found] ` <49DA2F54.8090109@redhat.com>
2009-04-07 17:00 ` AW: AW: " BRAUN, Stefanie
2009-04-07 17:34 ` Avi Kivity
2009-04-08 11:38 ` AW: " BRAUN, Stefanie
2009-04-09 15:34 ` BRAUN, Stefanie
2009-04-11 16:19 ` Avi Kivity [this message]
2009-04-14 8:26 ` AW: " BRAUN, Stefanie
2009-04-14 8:47 ` Avi Kivity
2009-04-16 13:27 ` AW: " BRAUN, Stefanie
2009-04-16 14:40 ` Avi Kivity
2009-04-06 12:13 ` Hauke Hoffmann
2009-04-06 16:30 ` AW: " BRAUN, Stefanie
2009-04-07 12:58 ` BRAUN, Stefanie
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