From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Brady Subject: Re: Sending packet at fixed rate really bad performance Date: Mon, 25 Jan 2010 12:15:53 +0000 Message-ID: <4d6de31b1001250415x2cd71d49qa148a3f956ccc5a4@mail.gmail.com> References: <4d6de31b0912301058j1dea3f2fud656822d29025266@mail.gmail.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0876943434==" Return-path: In-Reply-To: <4d6de31b0912301058j1dea3f2fud656822d29025266@mail.gmail.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org --===============0876943434== Content-Type: multipart/alternative; boundary=001485f91aee70c54f047dfc21d3 --001485f91aee70c54f047dfc21d3 Content-Type: text/plain; charset=ISO-8859-1 Hi Marco On Sun, Sep 27, 2009 at 07:26:49PM +0200, Marco Tizzoni wrote: > Hi all, > I'm doing some tests about i/o performance and cpu overhead in dom0. > I've coded a small tool that can sends UDP packets at fixed rate or > flood. While sending packet at fixed rate I'm experiencing performance > problem, related to how Xen handle signal, I guess. > > On my laptop (Core2 duo P8700), with no Xen running, I can send > packets at a rate of 20k, 40k, 60k, 80k/s achieving an actual packet > rate per second pretty near to the requested rate. > > On Xen (dom0 with no guest running and no load - Athlon 64 dual core > 4000+ ), the performance are really bad. Did you find a solution to this? We are experiencing the same problem on hosts which are processing VoIP packets. Like your test application, the packets are periodic but high in volume. Regards, Richard -- Richard Brady T: +44 (0)7771 623 348 E: rnbrady@gmail.com --001485f91aee70c54f047dfc21d3 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Marco

On Sun, Sep 27= , 2009 at 07:26:49PM +0200, Marco Tizzoni wrote:
> Hi all,
> I&= #39;m doing some tests about i/o performance and cpu overhead in dom0.
> I've coded a small tool that can sends UDP packets at fixed rate o= r
> flood. While sending packet at fixed rate I'm experiencing pe= rformance
> problem, related to how=A0Xen=A0=A0handle signal, I guess.
>
> On my laptop (Core2 duo P8700), with no=A0Xen=A0running, I can send
> packets at a rate of 20k, 40k, 60k, 80k/s achieving an actual packet> rate per second pretty near to the requested rate.
>
> O= n=A0Xen=A0(dom0 with no guest = running and no load - Athlon 64 dual core
> 4000+ ), the performance are really bad.

Did you find a solutio= n to this?

We are experiencing the same problem on hosts which are p= rocessing
VoIP packets. Like your test application, the packets are peri= odic but
high in volume.

Regards,
Richard

-= -
Richard Brady
T: +44 (0)7771 623 348
E:=A0rnbrady@gmail.com --001485f91aee70c54f047dfc21d3-- --===============0876943434== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel --===============0876943434==--