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[Xen-users] Xen asymmetric bandwidth

from [Ralf Lübben]

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Subject:	[Xen-users] Xen asymmetric bandwidth
From:	Ralf Lübben <ralfluebben@xxxxxx>
Date:	Wed, 22 Jun 2005 11:47:38 +0200
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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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