Re: [Xen-devel] Sending packet at fixed rate really bad performance

[Richard Brady <rnbrady@xxxxxxxxx>]

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@xxxxxxxxx
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