From Dan Kenigsberg <dan...@redhat.com>: Dan Kenigsberg has submitted this change and it was merged.
Change subject: virt: Report downtime after a post-copy migration ...................................................................... virt: Report downtime after a post-copy migration There are two migration downtime length values provided by libvirt after a completed migration: `downtime' and `downtime_net'. Ideally, `downtime' provides the complete downtime length, but only under the assumption that the clocks on the hosts are perfectly synchronized. If they are not, the value may be screwed by the clock differences. For this reason, we report `downtime_net' for pre-copy migrations, which includes only the time needed to transfer the data (and not other overheads), but is correct even when the clocks are not perfectly synchronized. `downtime_net' is not reported for post-copy migrations as it is always zero. So only `downtime' can be reported for post-copy migrations, regardless of the potential problem with the clocks. Engine and other tools reporting the downtime must take into account the differences of the downtime value in pre-copy and post-copy. Change-Id: I5f34e1ff577db325cc976431b3570f91833ff815 Signed-off-by: Milan Zamazal <mzama...@redhat.com> Bug-Url: https://bugzilla.redhat.com/1354343 --- M lib/vdsm/libvirtconnection.py M vdsm/clientIF.py M vdsm/virt/vm.py 3 files changed, 18 insertions(+), 2 deletions(-) Approvals: Jenkins CI: Passed CI tests Francesco Romani: Looks good to me, approved Milan Zamazal: Verified -- To view, visit https://gerrit.ovirt.org/64144 To unsubscribe, visit https://gerrit.ovirt.org/settings Gerrit-MessageType: merged Gerrit-Change-Id: I5f34e1ff577db325cc976431b3570f91833ff815 Gerrit-PatchSet: 22 Gerrit-Project: vdsm Gerrit-Branch: master Gerrit-Owner: Milan Zamazal <mzama...@redhat.com> Gerrit-Reviewer: Arik Hadas <aha...@redhat.com> Gerrit-Reviewer: Dan Kenigsberg <dan...@redhat.com> Gerrit-Reviewer: Francesco Romani <from...@redhat.com> Gerrit-Reviewer: Jenkins CI Gerrit-Reviewer: Milan Zamazal <mzama...@redhat.com> Gerrit-Reviewer: gerrit-hooks <automat...@ovirt.org> _______________________________________________ vdsm-patches mailing list -- vdsm-patches@lists.fedorahosted.org To unsubscribe send an email to vdsm-patches-le...@lists.fedorahosted.org
