[Fedora-xen] Xen/Linux 3.4.2 performance

[M A Young]

On Mon, 2 Jul 2012, W. Michael Petullo wrote:

> We have seen a significant reduction in performance in our research DomU
> OS kernel when running on Fedora 16 with Linux 3.4.2 vs. 3.3.7. We run
> a series of benchmarks which are DomU-kernel-space-CPU-heavy; many of
> these run 10x slower when using the 3.4.2 Linux kernel as Dom0.
>
> This is a little surprising---we've been tracking the Fedora kernels for
> a long time with no problem like this. Did anyone else notice any changes?

I have noticed a slow boot on one of my systems and it has been known to 
loose connections with keyboard and mouse when a guest is started. Given 
the previous issues with this system I suspect IRQ issues with the kernel 
interacting with xen though I haven't investigated further.

 	Michael Young