From: Avi Kivity <avi@redhat.com>
To: "BRAUN, Stefanie" <Stefanie.Braun@alcatel-lucent.de>
Cc: kvm@vger.kernel.org
Subject: Re: AW: AW: KVM performance
Date: Tue, 07 Apr 2009 20:34:02 +0300 [thread overview]
Message-ID: <49DB8E8A.1090908@redhat.com> (raw)
In-Reply-To: <133D9897FB9C5E4E9DF2779DC91E947C51834E@SLFSNX.rcs.alcatel-research.de>
BRAUN, Stefanie wrote:
> 1. Subtest: VLC reads video from local disk and streams it via udp to another pc
> Host performance: 11% 11%
> kvm process in host (top): 22% 22%
> vlc process in vmu (top): 15% 7%
>
>
While this isn't wonderful, it's not your major bottleneck now. What's
the bandwidth generated by the workload?
>
> 4. Subtest: Reading video locally, adding a logo to the video stream and then saving the video locally
> Host performance: 50% 50%
> kvm process in host (top) : 99% 99%
> vlc process in vmu (top) : 99% 99%
>
Now this is bad. Please provide the output of 'kvm_stat -1' while this
is running. Also, describe the guest. Is it Linux? if so, i386 or
x86_64? and is CONFIG_HIGHMEM enabled?
UDP performance is a known issue now, and we are working on it. TCP is
much better due to segmentation offload.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2009-04-07 17:33 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 [this message]
2009-04-08 11:38 ` AW: " BRAUN, Stefanie
2009-04-09 15:34 ` BRAUN, Stefanie
2009-04-11 16:19 ` Avi Kivity
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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