https://bugzilla.kernel.org/show_bug.cgi?id=42600 Summary: Live migration of very large vm get's stuck Product: Virtualization Version: unspecified Kernel Version: 2.6.32-131.6.1.el6.x86_64 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: kvm AssignedTo: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx ReportedBy: florian.rustedt@xxxxxxxxxxxxxxxx Regression: No We have several high load Tomcat servers virtualized on Scientific Linux via KVM. Configuration is between 10 and 30 GB of RAM and between 8 and 12 cores per VM. What i can see so far is, that after round about 20% of migration the progress get's slower and slower and finally the migration runs into a timeout, sometimes also with a broken source vm, means stuck and needs to be rebootet :( Both hypervisor servers are connected via 1 GB interface, so bandwidth should be fine. The Hypervisors are Intel modular server blades with 2x6cores and 96GB of RAM, connected to a shared storage. >From theory i would asume two possible explanations: 1. dirty RAM is changing too frequently and migration is transfering slower than the changes are differing in size 2. Too much CPU's and therefore running threads break down migration performance If one of theese explanations is true, this is not a bug, but a problem ;) -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
