Chegu Vinod <chegu_vi...@hp.com> wrote: > On 4/30/2013 8:20 AM, Juan Quintela wrote: >>> >>> (qemu) info migrate >>> capabilities: xbzrle: off auto-converge: off <---- >>> Migration status: active >>> total time: 1487503 milliseconds >> 148 seconds > > 1487 seconds and still the Migration is not completed. > >> >>> expected downtime: 519 milliseconds >>> transferred ram: 383749347 kbytes >>> remaining ram: 2753372 kbytes >>> total ram: 268444224 kbytes >>> duplicate: 65461532 pages >>> skipped: 64901568 pages >>> normal: 95750218 pages >>> normal bytes: 383000872 kbytes >>> dirty pages rate: 67551 pages >>> >>> --- >>> >>> (qemu) info migrate >>> capabilities: xbzrle: off auto-converge: on <---- >>> Migration status: completed >>> total time: 241161 milliseconds >>> downtime: 6373 milliseconds >> 6.3 seconds and finished, not bad at all O:-) > That's the *downtime*.. The total time for migration to complete is > 241 secs. (SpecJBB is > one of those workloads that dirties memory quite a bit).
Sorry, you are right. Imressive anyways for such small change. >>> +/* To reduce the dirty rate explicitly disallow the VCPUs from spending >>> + much time in the VM. The migration thread will try to catchup. >>> + Workload will experience a greater performance drop but for a shorter >>> + duration. >>> +*/ >>> +void *migration_throttle_down(void *opaque) >>> +{ >>> + throttling = true; >>> + while (throttling_needed()) { >>> + CPUArchState *penv = first_cpu; >> I am not sure that we can follow the list without the iothread lock >> here. > > Hmm.. Is this due to vcpu hot plug that might happen at the time of > live migration (or) due > to something else ? I was trying to avoid holding the iothread lock > for longer duration and slow > down the migration thread... Well, thinking back about it, what we should do is disable cpu hotplug/unplug during migration (it is not working well anyways as Today). Thanks, Juan.