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[Xen-devel] Low performance and some problem with kernel and xen 4.0-rc1

Server is Dell T610 with last bios (2.0.13)
Dom0: Lenny 64 bit, kernel, xen 4.0-rc1
Kernel is last commit of jeremy git xen/stable-2.6.32.x with this config: 
http://old.nabble.com/file/p28704783/config- config- 
lspci -vvv:  http://old.nabble.com/file/p28704783/lspcivvv.log lspcivvv.log 
dmidecode:  http://old.nabble.com/file/p28704783/dmidecode.log dmidecode.log 
dmesg:  http://old.nabble.com/file/p28704783/dmesg dmesg 
lsmod:  http://old.nabble.com/file/p28704783/lsmod.log lsmod.log 
xend log:  http://old.nabble.com/file/p28704783/xend.log xend.log 
title           Xen 4 / Debian GNU/Linux, kernel
root            (hd0,0)
kernel          /boot/xen.gz dom0_mem=2560M
module          /boot/vmlinuz- root=LABEL=root-backup2 ro nomodeset
module          /boot/initrd.img-

The server run 12 domU windows xp with gplpv, all work
On dom0 blktap not work (write about in other topic) and i must chage domU
disk from tap:aio to file, is one or the problem about performance?
With not set of dom0 memory and dom0 balloning have "freeze" with last msg
calltrace about out of memory, i set dom0 memory in menu.lst and disable
dom0 balloning, is necessary more ram that 2.5gb for dom0?
There are some option in .config of kernel wrong or not good?
with c state option in bios enable system is inusable, now i disable it but
this is kernel, xen or bios problem?

I hope this information helps improve the kernel and xen, tell me if need
another information

Thanks for any reply about my questions

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