[Xen-users] 101th domU fails to start with "SETVCPUCONTEXT failed"

[Lennert Van Alboom <lennert.vanalboom@xxxxxxxxxx>]

Hello there,


We (a small hosting community) are running a steadily growing number of Xen 
domUs on a quad dualcore Xeon server with 64GB ram. We've got 100 running 
domUs at the moment. Trying to create a new one results in this error:
Error: (1, 'Internal error', 'launch_vm: SETVCPUCONTEXT failed (rc=-1)\n')

If I shut down another domain, I can create one again, but the limit
seems to be 100 domUs. 
Each domU has one network interface and one or two disk devices (raid-1
md device consisting of two iscsi luns).

Version of Xen is rather old: 3.2.1-amd64 (Debian). 

Can anyone give me hint as to what causes this behaviour? The host
machine should be able to cope with the amount of domUs easily. I've got
a feeling I'm bumping into an obscure sourcecode parameter somewhere.


Thanks in advance,


Lennert


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