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[Xen-devel] etherbridge bottleneck

To: xen-devel@xxxxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] etherbridge bottleneck
From: David Becker <becker@xxxxxxxxxxx>
Date: Wed, 10 Nov 2004 16:48:45 -0500
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I ran some iperf tests today and it looks like the etherbridge
is the limiting factor on throughput.  In the beforetime, I saw great
throughput to the VMs; over 800 Mbps.   With the bridge, the numbers
are in the 400s somewhere.
Is this the speed I can expect from the bridge?
Is there some tuning I should try, or another way to get more bandwidth
into the VMs?

This is with xen-2.0, 2.4.27-xen0 and 2.4.27-xenU.  

My iperf numbers:
 940 Mbps  stock linux -> stock linux
 470 Mbps  stock linux -> xenU
 533 Mbps  xenU -> stock linux 

ether bridge speed
 533 Mbps  xenU -> xen0  on the same host
 422 Mbps  xen0 -> xenU  on the same host

loopback speed
 4.4 Gbps  stock linux 
 3.2 Gbps  xenU
 3.2 Gbps  xen0

(stock linux is 2.4.25)

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