CentOS virt - Apr 2010 - Connection stall when connecting to XEN guests

Hello

I have a physical server (Dell Poweredge  1950III) running current 
CentOS 5.4 x86_64 and the XEN hypervisor, provided by CentOS.

This machine has 2 virtual machines installed, both with CentOS 5.4 x86_64.

Unfortunatly SSH connections coming both, from an external machine or 
from DOM0, regularly stall, for a period of some minutes. In other 
words, while working through SSH, at a given moment everything freezes 
and after some minutes thaws again.

We have several other machines with similar hardware/software 
configurations, but none of these has similar stalls.

Anyway, when attaching the console with "xm console <vm-name>"
there are
no stalls at all.

Does anybody have any suggestion on where to start to trouble shoot this 
problem?

Regards,

Peter

-- 
 
Dott. Peter Hopfgartner
 
R3 GIS Srl - GmbH
Via Johann Kravogl-Str. 2
I-39012 Meran/Merano (BZ)
Email: peter.hopfgartner at r3-gis.com
Tel. : +39 0473 494949
Fax  : +39 0473 069902
www  : http://www.r3-gis.com

XING : http://www.xing.com/go/invita/8917535

Ive seen this happen in some distros when the option
'UseDNS' is set to yes in the file sshd_config

Of course, there could be issues with your network setup as
well...