I have been running RHEL 5.7 on a host just fine with several VMs (KVM). No major issues. Time came to upgrade to RHEL 6.1 as a few bugs had been fixed in this release.
When I start a VM or two under RHEL 6.1, the system becomes really sluggish. Even through SSH, keystrokes appear with delay. System resources appear OK, except dstat reports "missed X ticks" (number varies from 1 < 20). I am using virtio on all the guests.
The server has decent hardware (IBM x3850 with 128G RAM).
Is anyone running RHEL 6.1 with KVM successfully?
I've tried it on 2x servers so far and got the same result!