Michal Skrivanek has posted comments on this change. Change subject: migrations: change migration parameters ......................................................................
Patch Set 2: we're testing that a bit more with mpolednik. so far the best values seem to be: concurrency 2 bandwidth 52 stalling 240 downtime_delay 20 downtime steps 5 why? 1Gb network, with 2 migrations should occupy 832Mbps, practically the line can handle ~880Mbps, so we have a 50Mbps buffer even in the worst case stalling - 150 was very often not enough. rasising from 2.5 minute to 4 might significantly help to overcome peaks in memory usage, but still conservative enough. downtime - 10 steps with 75s per GB is too much. theoretically you need less than 20s at 52MB/s on 1Gb line to transfer everything. In reality there are zero pages costing nothing, and dirty memory on the other hand. So roughly 20s to get through one full pass is enough, then it makes sense to tweak downtime. The algorithm is not ideal either, so 10->5 means it's going to increase sooner what do you think? -- To view, visit https://gerrit.ovirt.org/55676 To unsubscribe, visit https://gerrit.ovirt.org/settings Gerrit-MessageType: comment Gerrit-Change-Id: I1ed1b04ee77a7144ae0206e5c5ae1426ede0c75f Gerrit-PatchSet: 2 Gerrit-Project: vdsm Gerrit-Branch: master Gerrit-Owner: Tomas Jelinek <tjeli...@redhat.com> Gerrit-Reviewer: Dan Kenigsberg <dan...@redhat.com> Gerrit-Reviewer: Francesco Romani <from...@redhat.com> Gerrit-Reviewer: Jenkins CI Gerrit-Reviewer: Michal Skrivanek <michal.skriva...@redhat.com> Gerrit-Reviewer: Tomas Jelinek <tjeli...@redhat.com> Gerrit-Reviewer: gerrit-hooks <automat...@ovirt.org> Gerrit-HasComments: No _______________________________________________ vdsm-patches mailing list vdsm-patches@lists.fedorahosted.org https://lists.fedorahosted.org/mailman/listinfo/vdsm-patches
