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[Xen-users] Re: Xen asymmetric bandwidth

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Re: Xen asymmetric bandwidth
From: Ralf Lübben <ralfluebben@xxxxxx>
Date: Wed, 22 Jun 2005 14:00:07 +0200
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Ralf Lübben wrote:

I did benchmarking again on 100MBit network.
I have there the same effect. I can send to the domain with about 90MBit/s
but only receive 45MBit/s when I send and receive simultaneous.
But if I use the domain as a router I get about 90MBit/s in both directions.

Ralf Lübben

> Hello,
> I did some network benchmarking on Xen.
> The setup were two pentium 4 2.66 machines with xen kernel 2.6.10 and
> gigabit ethernet cards.
> I did the benchmark with iperf.
> On a normal system I get a maximum bandwidth of 620MBit/s and with Xen
> about 500MBit/s.
> With Iperf you have the possibility to send and receive simultaneous.
> On the normal system distribution is symmetric. Pro channel about
> 310MBit/s so the sum is 620MBit/s again. On Xen the distribution is
> asymmetric. The domain can receive about 320MBit/s but it can only send
> 180MBit/s. The sum is also 500MBit/s.
> Has anybody an idea why the distribution is asymmetric?
> Thanks.
> Greetings
> Ralf Lübben

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