On Fri, Jun 29, 2007 at 09:07:49PM +0900, Kazushi Marukawa wrote:
> Interesting.  I misunderstood.  I thought the recent domU
> are slower than old domU because the recent dom0 make recent
> domU slow.  I was wrong.
> 
> With 20070627 dom0 kernel w/ my locore.S patch and Xen
> 3.1.0, I got following numbers.
> 
> 0518 domU			10.913 real
> 0624 domU w/ locore patch	19.776 real
> 0627 domU w/ locore patch	19.776 real
> 
> So, these recent domU are slow on my machine because they
> just run slow not dom0 make them slow...  Interesting, but
> now I completely have no idea how to find out the reason why
> my PC domU is so slow.  hehe

Maybe it's just a cache alignement issue with this specific application.
My system is a dual-xeon 5050:
(XEN) CPU: Trace cache: 12K uops, L1 D cache: 16K
(XEN) CPU: L2 cache: 2048K

-- 
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
     NetBSD: 26 ans d'experience feront toujours la difference
--