Are you using the
hyperthreads as VCPUs? If so, that could be your problem, I have heard of
decent results with them, but also of nightmarish ones.
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Paul Tomblin
Sent: Wednesday, June 30, 2010 08:54
Subject: [Xen-users] DomU load average much higher after hardware change
3 domUs, one with memory=1000 and vcpus=2, the others with memory=425, vcpus=1
using 2.6.26-2-xen-686 kernel and modules.
2 2.8GHz Xeons (with hyperthreading, so it looks like I've
got 4 cpus in /proc/cpuinfo)
3 domUs, one with memory=2000 and vcpus=2, the others with
using 2.6.26-2-xen-amd64 kernel and modules.
You'd think that in the "After" case, everything
would run much faster, but what I'm finding in the big domU is that my load
average is consistently much higher - from being in the 0.2-0.3 range, I'm
currently averaging 0.69 according to Munin, although it looks like it's
spending a lot more time in the 1.0+ range than it ever did before.
Is there something I'm doing wrong? Should I increase
vcpus to 4 and 2 respectively?