Re: [Xen-devel] Hyperthreading network benchmark

[Adam Heath <doogie@xxxxxxxxxx>]

On Sat, 30 Oct 2004, Kip Macy wrote:

> They've seen anywhere from a 30% decrease to 30% increase in performance
> on SPECint with hyperthreading turned on. Bear in mind you're now
> sharing a single cache between two processes. For many workloads the
> trace cache on the P4 was too small to begin with.

Not just 2 processes.  2 whole operating systems.  An operating system has a
much higher overhead, and you'll probably get lots of cache trashing.

Note, once xen supports SMP, then it might help if it's scheduler were
HT-aware.  Also, why not use normal linux schedulers(don't know if you
currently are)?


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