Xen users - Oct 2008 - Xen 3.0.3 (Centos 5.2) Network Performance Issues

I am trying to figure out why the network speed of my VMs are slow.

 

Here is the setup:

 

HP dual quad core, 18GB of RAM, 3x 72GB in a RAID 5

1)      One VM is a Windows 2003, SQL 2005 server, running a single
network heavy old proprietary Access DB.

2)      Other VM is a Windows 2003, Citrix Metaframe 4.5 (latest... I
guess its Xenapp now)

 

What I am seeing, is that the network cards appear to cap out at much
lower rates, around 33mbit/sec rather than the full 100mbit a sec they
are connected to the network at.

 

CPU,Disk, Memory seem hardly used.

 

I''ve also installed the open source PV drivers on the Windows VMs, and
I
do get a Xen Bridge interface, but I also get a "disconnected lan
cord"
on this device. Is it actually working?

 

Is there something obvious (or not so obvious) that I could do to try to
get some improved network speed out of my VMs?

 

Thanks,

Justin



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