[dajones70]

I have the same problem on a CentOS 5.3 32-bit Xen VM. Strange thing is that the 64-bit Xen VM on another CentOS 5.3 server doesn't have the problem

This works
Linux 2.6.18-128.1.6.el5xen #1 SMP Wed Apr 1 09:53:14 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
Release 5.0.18_GA_3011.RHEL5_64_20090707171702 CentOS5_64 FOSS edition

This doesn't work
Linux 2.6.18-92.1.22.el5xen #1 SMP Tue Dec 16 13:08:49 EST 2008 i686 i686 i386 GNU/Linux
Release 5.0.18_GA_3011.RHEL5_20090707151729 CentOS5 NETWORK edition