[Xen-users] Windows Server 2008 R2 is unusable with more than 16 vcpus

[Jan Hejl <jh@xxxxxxxxxx>]

Hi all,

i'm running 5 linux domUs (2-4 CPUs, 1-3GB RAM, vcpu weight 256) and one 
Windows 2008 R2 (16 CPUs and 8GB RAM, vcpu weight 224) as a terminal 
server. In this configuration Windows works perfectly. When I set 
Windows domU with 32 cores it's bit laggy. Actually I'm able to connect, 
server manager shows up everything seems fine, but that's all i can do. 
I can't run any other app or shut it down. Mouse moves slowly.
Dom0 is 16 vcpus and 32GB RAM build on two 16 core AMD Opteron 6274 - 32 
core together with 64GB RAM and RAID5 SSD LVM2 storage.
No log information at all.

Can someone please help me? I'm doing something wrong?

Thank you
Jan

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