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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=49DB8E8A.1090908@redhat.com \
--to=avi@redhat.com \
--cc=Stefanie.Braun@alcatel-lucent.de \
--cc=kvm@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.