From: Marco Tizzoni <marco.tizzoni@gmail.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: Sending packet at fixed rate really bad performance
Date: Mon, 28 Sep 2009 18:28:04 +0200 [thread overview]
Message-ID: <f9611b0f0909280928x58af650bob7c6589f5423c6af@mail.gmail.com> (raw)
In-Reply-To: <20090928141731.GA7107@phenom.dumpdata.com>
[-- Attachment #1: Type: text/plain, Size: 1285 bytes --]
On Mon, Sep 28, 2009 at 4:17 PM, Konrad Rzeszutek Wilk
<konrad.wilk@oracle.com> wrote:
> Lets narrow this down a bit. You are comparing two different systems
> with potentially different interfaces. Lets concentrate on one machine
> first. Is the performance on your Athlon 64 without Xen (meaning you
> boot without Xen) in the same ball-park figure?
> I want to make sure we can eliminate the hardware being at fault here.
I've already done many tests to isolate the problem before writing here.
I've tried to use a different nic, different LAN, different switch and
loopback as well, same results.
Anyway forget aboout Athlon and let compare the same software, on the
same hardware with linux and xenolinux.
I've connected two pc running linux via a cross-cable and made some
tests. The test achieves good results in this case for rate over 10k
packets/second.
On xenolinux (credit and sedf behaviour the same) the performance are
really bad, 250 packets/second (as before).
Also I've just modified my software to not send packets, but simply
count, so no sendto() is involved. Same low rate.
May be there's something wrong in my code (not yet finished). Attached
you can find it if you want have a look or try to reproduce this
issue.
thx,
Marco
[-- Attachment #2: main.c.gz --]
[-- Type: application/x-gzip, Size: 2454 bytes --]
[-- Attachment #3: Type: text/plain, Size: 138 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
next prev parent reply other threads:[~2009-09-28 16:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-27 17:26 Sending packet at fixed rate really bad performance Marco Tizzoni
2009-09-28 14:17 ` Konrad Rzeszutek Wilk
2009-09-28 16:28 ` Marco Tizzoni [this message]
2009-09-28 16:44 ` Konrad Rzeszutek Wilk
2009-09-28 18:00 ` Marco Tizzoni
[not found] <4d6de31b0912301058j1dea3f2fud656822d29025266@mail.gmail.com>
2010-01-25 12:15 ` Richard Brady
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=f9611b0f0909280928x58af650bob7c6589f5423c6af@mail.gmail.com \
--to=marco.tizzoni@gmail.com \
--cc=konrad.wilk@oracle.com \
--cc=xen-devel@lists.xensource.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).