[Xen-users] Network optimization ?

["Olivier B." <xen.list@xxxxxxxxx>]

Hi,

I'm trying to see if there is a way to optimize network on DomU (pv 
guests), with Xen 4.
I do my benchmarks only with "iperf", with default configuration and 
64KB TCP window size.
From my tests transfer rate drop from 3.19 Gbits/sec on Dom0 to 925 
Mbits/sec on DomU, yes 72% slower.
I test with this hosts :
- a dedicated server
- a dom0 on another dedicated server
- the uniq domU on the same server

On the first dedicated server, I start "iperf -s". Then I launch "iperf 
-c 10.10.10.10" on Dom0 then on the DomU.
Both Dom0 and DomU are Debian Squeeze 64bits, I tried to tune the credit 
scheduler without success.
I didn't use cpu pinning, but the physical host have 24 threads (2 * 6 * 
2 with hyperthreading), Dom0 is limited to 4 CPU and DomU have 2 VCPU.
The Dom0 use bridge networking, and ipforward is disabled. There is no 
iptable rules on servers, and the conntrack modules are not loaded.
Is there other things to do to improve network optimization ?

Thanks,
Olivier

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