As another test (still running qemu-git-2.1.0-rc2-git-20140721), I disabled NTP on the two servers (and rebooted them), but left it running on the guest.
When doing the migration, server a (where the guest was running) had an NTP offset of -3.037619 s, and server b was at -3.337718 s. The guest was nicely synchronized before the migration, but afterwards had a clock offset of 0.349590 s, which roughly corresponds to the difference in offsets. The small NTP offset on the guest after the migration implies that it did briefly freeze, but too short to notice. I'll leave it running for longer to be able to confirm this with sufficient accuracy.
As another test (still running qemu-git- 2.1.0-rc2- git-20140721) , I disabled NTP on the two servers (and rebooted them), but left it running on the guest.
When doing the migration, server a (where the guest was running) had an NTP offset of -3.037619 s, and server b was at -3.337718 s. The guest was nicely synchronized before the migration, but afterwards had a clock offset of 0.349590 s, which roughly corresponds to the difference in offsets. The small NTP offset on the guest after the migration implies that it did briefly freeze, but too short to notice. I'll leave it running for longer to be able to confirm this with sufficient accuracy.