[Xen-users] poor network performance on domU

[Teun Vink <teun@xxxxxxxxxxxxx>]

Hi all,

I recently started with Xen (3.1.0) on my new server running Ubuntu  
Gutsy (7.10) and I'm experiencing very poor network performance on my  
domU's.
Since my colo provider offers me a /28 of routed public IPs next to  
one interconnection IP to their routers, I built a Xen configuration  
as described in http://www.debian-administration.org/articles/360 (a  
routed setup instead of the default bridged). This works as expected:  
all domU's are accessible from the internet.
The network performance of the Dom0 is fine: I can saturate my 100Mb/ 
sec uplink both by uploading and downloading. Performance towards the  
domU is fine as well. Performance from the DomU's to the internet  
however is dramatic: speeds start at 2-3MB/sec but quickly drop to  
just a few KB/sec (!). Transfer of large files never end at all.
The server I'm running this on is a Supermicro H8SSL-i2 with and AMD  
Opteron 1218 Dual Core proc, 4GB RAM, the NIC is a Broadcom 1G  
interface connected to a 100Mb/sec switchport at my ISP.
I've tried searching these archives (and the internet) for any clue  
what might cause this poor upload performance, but failed to find  
anything really useful.
If anyone has hints and tips on how to make my DomU's uplink speed  
normal, I'd really appreciate it. I really have no idea where to look  
now :(
TIA,

Teun



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