How to increase XEN speed

I have updated my XEN server from 2.6.27.56 to 3.1.0 and it feels dead slow.

About my Hardware:
AMD Phenom II X6
16GB Ram
Onboard NIC + Intel NIC
(Adaptec RAID1 + RAID6)

About my Config:
WinXP-VM (1 Core + 2GB) > no speed relevance
WinXP-VM (1 Core + 2GB) > no speed relevance
WinXP-VM (2 Core + 4GB) > high speed relevance (database)
bridge br0 to onboard NIC and VM 1+2
bridge br1 to onboard NIC and VM 3
kernel options dom0_max_vcpus=1 dom0_vcpus_pin dom0_mem=2048M

I didn’t found any hotwos for increasing XEN speed, only some nuggets in different docs.

Need help.

Thanks in advance

BR
Matthias

Found via xm vcpu-list a big cpu load difference between then main domU (database) and dom0.
Therefore i changed the domain-configs as follows:
In /boot/grub/menu.lst:
kernel options dom0_max_vcpus=2 dom0_vcpus_pin dom0_mem=2048M
In /etc/xen/vm/<vm1> and <vm2>:
cpus=“4-5”
In /etc/xen/vm/<vm3>:
cpus=“2-3”

Now the load of dom0 and domU is more even.
Seems to be a little bit better, but not enough.

Matthias

Might change out these blogs:

C.F.U. - CPU Frequency Utilitiy - Version 1.10 - For use with the cpufrequtils package - Blogs - openSUSE Forums

YaST Power Management - Control Your CPU Energy Usage How To & FAQ - Blogs - openSUSE Forums

Thank You,