[Xen-users] Xen 4.0.1 : new DomUs are slow

[Nicolas G <redf4lcon@xxxxxxxxx>]

Hello,

I'm having troubles running  vms under a squeeze 
64bits+xen 4.0.1 hypervisor in NAT mode. My main problem is a recently 
created vm for SQL is slow 20/40 mins after boot, whereas hypervisor and
 the existing web vm are working fine. I also tried to create new DomU 
with various vcpu/ram amount, they always become slow 20/40 mins after 
boot. 

Charge level :
- Hypervisor : about 1% cpu and 10% ram
- Web vm : 10% cpu 15% ram
- SQL vm : 1% cpu 5% ram

My setup is the following :

Hypervisor (Nat adress : 10.0.0.128):
- Dell r210 : Xeon L3426 + 2*2To Raid 1+ 16Gb DDR3 ECC

- XM infos : http://pastebin.com/QBqRiwqe
- ifconfig : http://pastebin.com/NbZi9mp0
- iptable/firewall : http://pastebin.com/EcnviBmf

- route : http://pastebin.com/Jc7sZiA3
- ip forwarding already set to 1
- hypervisor can ping SQL normaly : http://pastebin.com/Q0gkTJKY

Web vm (working very well, local address : 10.0.0.3) :
- Debian squeeze 64bits
- 1 vcpu, 2Gb ram
- uname : Linux sql 2.6.32-5-xen-amd64 #1 SMP Wed Jan 12 05:46:49 UTC 2011 x86_64 GNU/Linux

SQL vm (very laggy, local address 10.0.0.5) :

- Debian squeeze 64bits
- 2 vcpu, 1Gb ram
- sql.conf : http://pastebin.com/EJHNQQPs
- ifconfig : http://pastebin.com/GsiB8iN6
- route + resolv.conf : http://pastebin.com/mUNFzDPT
- uname : Linux sql 2.6.32-5-xen-amd64 #1 SMP Wed Jan 12 05:46:49 UTC 2011 x86_64 GNU/Linux

- dmesg : http://pastebin.com/RBJgthrK
- various log files pieces, mainly about kernel messages : http://pastebin.com/471rGcaZ

I also noticed stranges I/O speed test results on SQL : http://pastebin.com/w6bbhZhh

Thanks for your help !
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