Comment 39 for bug 714335

FYI, +1 on this even when using the patched kernels:

Host system AMD Ubuntu 10.04 2.6.32-34-server

Guest system Ubuntu 10.04, have tried several kernels, including:

2.6.38-11-server (From backport as per above)
2.6.32-34-server
2.6.32-33-server
2.6.32-29-generic (From Deb package above)
2.6.32-24-server

In all cases I see performance reduced to a crawl and an eventual lock on the guest when using the SMP flag.

I've spent a few hours trying different kernels, this is a pre-production system with a few beta users on it so although I can do a reasonable amount of messing around I do need to leave it working sometimes!

I can however easily create new images and play with those, which I'm about to do - see if it's something that's been installed that's causing the problem and not the kernel.

If you want me to test anything happy to assist!