Hi, Han I just found flow-restore-wait option in ovs-vswitchd.conf.db(5) can we just use it to simulate ovn-ofctrl-wait-before-clear to reduce upgrade downtime in old version ovn
On Tue, 19 Apr 2022 at 03:23, Han Zhou <[email protected]> wrote: > Whenever OpenFlow connection between ovn-controller and OVS is > connected/reconnected, typically during ovn-controller/OVS > restart/upgrade, ovn-controller would: > 1. clears all the existing flows after the initial hand-shaking > 2. compute the new flows > 3. install the new flows to OVS. > > In large scale environments when there are a big number of flows > needs to be computed by ovn-controller, the step 2 and 3 above can take > very long time (from seconds to minutes, depending on the scale and > topology), which would cause a data plane down time. > > This series solves the problem: patches 1 and 2 avoids the down time > introduced > by step 2; patches 3 and 4 avoids the down time introduced by step 3. > > A test shows zero ping loss (with 0.1s interval), while without the > patches it > was 100% ping drops during ~13s. > > Han Zhou (4): > ofctrl: Wakeup when entering S_UPDATE_FLOWS. > ofctrl: Support ovn-ofctrl-wait-before-clear to reduce down time > during upgrade. > ofctrl.c: Include group changes to bundle. > ofctrl.c: Use bundle to avoid data plane downtime during the first > flow installation. > > controller/ofctrl.c | 275 +++++++++++++++++++++----------- > controller/ofctrl.h | 4 +- > controller/ovn-controller.8.xml | 34 ++++ > controller/ovn-controller.c | 6 +- > tests/ovn-controller.at | 52 ++++++ > 5 files changed, 275 insertions(+), 96 deletions(-) > > -- > 2.30.2 > > _______________________________________________ > dev mailing list > [email protected] > https://mail.openvswitch.org/mailman/listinfo/ovs-dev > -- 刘梦馨 Blog： http://oilbeater.com Weibo: @oilbeater <http://weibo.com/oilbeater> _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
