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

[Marco Tizzoni <marco.tizzoni@xxxxxxxxx>]

On Mon, Sep 28, 2009 at 6:44 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:

> The problem you described was with two guests. Were those two guests
> on two different machines or on the same box?

The 1st box runs Xen and sends packet to the 2nd box.
The test runs on dom0 with no load at all (the same behaviour occurs
with 1 domU sending packets and dom0 doing nothing).
The 2nd box doesn't run xen and receive and counts udp packets
received without responding.


>> 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?

No, the 1st runs Xen and 2nd not.

> The tests executing
> under dom0 on both machines?

dom0 on the first box. domU, as said before, act in the same way.

Marco

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