Re: [Xen-users] Network nightmare. Is NAT better than bridge for DomU to DomU?

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

G. Michael Carter wrote:
> I'm having lots of fun with my xen machine...
>
> I've done all the tips I can find with sysctl and txqueuelen.   
> External machine to Xen Dom0 is about 40-50MB/s and to DomU's anywhere 
> between 10-40MB/s 
> But DomU to DomU is being a real pain.   Most times I only get 6MB/s.  
What OS/Xen versions? What type of domU (PV Linux, HVM)? How do you test 
network performance?
On my system (RHEL5.2/x86_64/xen-3.2.1/Xeon 5130), using iperf, i get 
400 - 900 Mbps. Performance is cpu-bound (since  they're all software 
NICs connected to the same bridge).
Here's the relevant content from my sysctl.conf
### network read/write buffer ###
# increase TCP max buffer size
net.core.rmem_max = 262144
net.core.wmem_max = 262144
net.core.rmem_default= 262144
net.core.wmem_default= 262144

# increase Linux autotuning TCP buffer limits
# min, default, and max number of bytes to use
net.ipv4.tcp_wmem=4096    87380   262144
net.ipv4.tcp_rmem=4096    87380   262144

Regards,

Fajar

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