From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Marco Tizzoni <marco.tizzoni@gmail.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: Sending packet at fixed rate really bad performance
Date: Mon, 28 Sep 2009 12:44:28 -0400 [thread overview]
Message-ID: <20090928164427.GA10292@phenom.dumpdata.com> (raw)
In-Reply-To: <f9611b0f0909280928x58af650bob7c6589f5423c6af@mail.gmail.com>
On Mon, Sep 28, 2009 at 06:28:04PM +0200, Marco Tizzoni wrote:
> 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.
The problem you described was with two guests. Were those two guests
on two different machines or on the same box?
> 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).
>
This is with two machines, each connected via cross-cable, running the same
version of Linux, and each running under Xen, correct? The tests executing
under dom0 on both machines?
> 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
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
next prev parent reply other threads:[~2009-09-28 16:44 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
2009-09-28 16:44 ` Konrad Rzeszutek Wilk [this message]
2009-09-28 18:00 ` Marco Tizzoni
[not found] <4d6de31b0912301058j1dea3f2fud656822d29025266@mail.gmail.com>
2010-01-25 12:15 ` Richard Brady
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