Francesco Romani has posted comments on this change.

Change subject: vm: migration: exponential downtime increment
......................................................................


Patch Set 3: Verified+1

Verified doing migration among two hosts: one with vanilla VDSM, one with 
patched VDSM. Inspected the downtime progression though logs:

Old progression:
Thread-71::DEBUG::2014-08-29 15:59:56,982::migration::360::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::migration downtime thread started
Thread-70::DEBUG::2014-08-29 16:00:20,905::migration::375::vm.Vm::(cancel) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::canceling migration downtime thread
Thread-71::DEBUG::2014-08-29 16:00:20,906::migration::372::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::migration downtime thread exiting
Thread-97::DEBUG::2014-08-29 16:24:07,093::migration::360::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::migration downtime thread started
Thread-97::DEBUG::2014-08-29 16:24:37,094::migration::369::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 50
Thread-97::DEBUG::2014-08-29 16:25:07,097::migration::369::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 100
Thread-97::DEBUG::2014-08-29 16:25:37,100::migration::369::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 150
Thread-97::DEBUG::2014-08-29 16:26:07,103::migration::369::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 200
Thread-97::DEBUG::2014-08-29 16:26:37,106::migration::369::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 250
Thread-97::DEBUG::2014-08-29 16:27:07,109::migration::369::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 300
Thread-97::DEBUG::2014-08-29 16:27:37,112::migration::369::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 350
Thread-97::DEBUG::2014-08-29 16:28:07,116::migration::369::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 400
Thread-96::DEBUG::2014-08-29 16:28:27,684::migration::375::vm.Vm::(cancel) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::canceling migration downtime thread
Thread-97::DEBUG::2014-08-29 16:28:27,684::migration::372::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::migration downtime thread exiting

New progression:
Thread-36::DEBUG::2014-08-29 16:19:10,845::migration::375::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::migration downtime thread started
Thread-36::DEBUG::2014-08-29 16:19:40,846::migration::384::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 1
Thread-36::DEBUG::2014-08-29 16:20:10,858::migration::384::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 1
Thread-36::DEBUG::2014-08-29 16:20:40,859::migration::384::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 3
Thread-36::DEBUG::2014-08-29 16:21:10,861::migration::384::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 6
Thread-36::DEBUG::2014-08-29 16:21:40,863::migration::384::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 12
Thread-36::DEBUG::2014-08-29 16:22:10,865::migration::384::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 22
Thread-36::DEBUG::2014-08-29 16:22:40,891::migration::384::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 41
Thread-36::DEBUG::2014-08-29 16:23:10,908::migration::384::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::setting migration downtime to 77
Thread-35::DEBUG::2014-08-29 16:23:33,317::migration::390::vm.Vm::(cancel) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::canceling migration downtime thread
Thread-36::DEBUG::2014-08-29 16:23:33,318::migration::387::vm.Vm::(run) 
vmId=`56d1c657-dd76-4609-a207-c050699be5be`::migration downtime thread exiting

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Gerrit-MessageType: comment
Gerrit-Change-Id: I6401772f52ea28144452e67198bddff18f6703eb
Gerrit-PatchSet: 3
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Francesco Romani <from...@redhat.com>
Gerrit-Reviewer: Dan Kenigsberg <dan...@redhat.com>
Gerrit-Reviewer: Francesco Romani <from...@redhat.com>
Gerrit-Reviewer: Michal Skrivanek <michal.skriva...@redhat.com>
Gerrit-Reviewer: Vinzenz Feenstra <vfeen...@redhat.com>
Gerrit-Reviewer: automat...@ovirt.org
Gerrit-Reviewer: oVirt Jenkins CI Server
Gerrit-HasComments: No
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