Francesco Romani has uploaded a new change for review. Change subject: vm: migration: exponential downtime increment ......................................................................
vm: migration: exponential downtime increment Migration downtime is calculated using an interpolation using the current downtime step (up to a configurabile maximum) and the maximum downtime. The downtime is incremented at each downtime step until it reaches the maximum, or the migration is finished. This patch changes the interpolation formula from linear to exponential, being the new one: d = c ** s where d is the downtime, s is the step and c is the exponentiation coefficient computed in such a way of when s = S (number of steps to perform), then we will have d = D (selected downtime). Please note that this patch still preserve an linear increment of the wait time. Change-Id: I6401772f52ea28144452e67198bddff18f6703eb Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1004101 Signed-off-by: Francesco Romani <from...@redhat.com> --- M vdsm/vm.py 1 file changed, 2 insertions(+), 1 deletion(-) git pull ssh://gerrit.ovirt.org:29418/vdsm refs/changes/20/25820/1 diff --git a/vdsm/vm.py b/vdsm/vm.py index c53f1d4..1d7b643 100644 --- a/vdsm/vm.py +++ b/vdsm/vm.py @@ -722,6 +722,7 @@ delay_per_gib = config.getint('vars', 'migration_downtime_delay') memSize = int(vm.conf['memSize']) self._wait = (delay_per_gib * max(memSize, 2048) + 1023) / 1024 + self._coeff = self._downtime ** (1 / float(self.DOWNTIME_STEPS)) self.daemon = True self.start() @@ -735,7 +736,7 @@ if self._stop.isSet(): break - downtime = self._downtime * (i + 1) / self.DOWNTIME_STEPS + downtime = int(self._coeff ** i) self._vm.log.debug('setting migration downtime to %d', downtime) self._vm._dom.migrateSetMaxDowntime(downtime, 0) -- To view, visit http://gerrit.ovirt.org/25820 To unsubscribe, visit http://gerrit.ovirt.org/settings Gerrit-MessageType: newchange Gerrit-Change-Id: I6401772f52ea28144452e67198bddff18f6703eb Gerrit-PatchSet: 1 Gerrit-Project: vdsm Gerrit-Branch: master Gerrit-Owner: Francesco Romani <from...@redhat.com> _______________________________________________ vdsm-patches mailing list vdsm-patches@lists.fedorahosted.org https://lists.fedorahosted.org/mailman/listinfo/vdsm-patches