[Xen-users] Large number of TCP sockets

[John <eisenhowerj@xxxxxxxxx>]

Hello all,

We're trying to move a farm of ancient physicals to VMs and experiencing 
some network issues.  The network problems are usually seen as TCP 
retransmits due to bad chksum and now we're seeing complete halt to 
network traffic (just to that VM, not the other residents) for ~10 
minutes.  The characteristics of the VM experiencing the problems; 2700 
sockets always open, 32bit app, 4 vcpus, Linux.  Using the network 
tuning guide on the wiki; I've messed with TCP offloading, various 
network params (no affect), and setting the affinity of the app to other 
than CPU0.  I've also tried openvswitch, that was brought to its knees 
so I'm back on linux bridge.  4 dom0 vcpus, one netback process at an 
avg. of 40%.
Anybody have experience with large number of sockets?  Or tried this: 
http://sourceforge.net/projects/xvmsocket/ I think I could configure my 
VM setup to accommodate it.
Thanks in advance,
John Eisenhower



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