On 10/30/2018 06:50 PM, Wanpeng Li wrote: > > If your "brownout period" is the time between previous get_dirty_log > and next get_dirty_log and the "blackout" is get_dirty_log? > No, the brownout period is the time during migration when the VM is still running on the source host. It will usually span multiple rounds of get_dirty_log calls and RAM transfers to the target host. The blackout period is when the VM completely stops running and includes one last get_dirty_log call to get the remaining pages.