Xen cluster n/w performance (again!)

[Diwaker Gupta <diwakergupta@gmail.com>]

Hey everyone,

A few weeks back there was some discussion on Xen's I/O performance in
clusters on the list. I did some experiments today myself using iperf
(not ttcp):

o Xen dom0 talking to another machine in the cluster running native
linux: b/w around 904Mbps, thats nice :)

o Xen VM (running on the same machine as the dom0 in the previous
experiment) talking to another machine running native linux (again,
same as in previous experiment) only achieves 128 Mbps

I read on the list that you folks at Cambridge got upto 800+ Mbps
across VMs? Did you guys do any special optimizations or set any
special parameters? I read something about socket buffer size?

Thanks,
-- 
Diwaker Gupta
http://resolute.ucsd.edu/diwaker


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