Re: [Xen-devel] Xen cluster n/w performance (again!)

[David Becker <becker@xxxxxxxxxxx>]

" Is anyone else still seeing network performance anomalies? 

I still cannot get over 500Mbps into xenU with any hardware that I have.
This holds using kernels I build, or using kernel binaries from
the 2.0.1 tarball.

I tried tuning a e1000 driver, which greatly reduced the interrupt count,
but had no effect on bandwidth.

I can get 600 to 750 Mbps into domain-0 from a stock linux host. 
That rate then drops to around 500 after starting the etherbridge.
Running top on Domain-0 claims the domain is over 60% idle.

This is with e1000 and bcm5703 NICs on IBM x335, Dell 1650 and
other platforms, and a variety of CPU clock speeds.
Running iperf under stock linux 2.4.25 gets 940Mbps between any of them.



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