On 1/31/23 16:37, Michael Prokop via discuss wrote: > Hi! > > On a Proxmox VE cluster using openvswitch v2.15.0 (as present in > Debian/bullseye[1]) we ran into a serious problem: after the > openvswitch-switch/ovs-vswitchd service restart the OVS bridge lost > its IP address and the interface stayed down. > > As it turned out this issue got already fixed by Ilya Maximets with > https://github.com/openvswitch/ovs/commit/bc0aa785a83c11dab482b3e20736b969174d9f86 > ("ovsdb-idl: Fix the database update signaling if it has never been > connected.") > > What was special about this issue for us is that we noticed > the problem *only* on multi-CPU systems (systems with >=2 CPUs). > Furthermore the issue didn't show up on any of our systems running > with Intel CPUs, but only on systems running with AMD CPUs. :) > > I'm curious, is this related to a concurrency/race condition? > And I'd like to understand whether this Intel vs. AMD behavior is > only coincidence related to different kernel/userland/libdpdk/... > environments, or if that could really show up as vendor specific > behavior as we saw it? :)
Hi. I don't think it's vendor-specific. There is nothing really vendor-specific here. There might be a slight race window, IIRC, i.e. how many main loop iterations ovs-vswitchd does before getting database updates, so the number of CPU cores (1 vs 2) may play some role. But even that is unlikely. In general, you should be able to reproduce the issue on any system. Best regards, Ilya Maximets. > > Thanks! > > [1] We reported this also towards Debian, full details at > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1008684#52 and a > fixed openvswitch package is on its way towards Debian/bullseye now, > see https://bugs.debian.org/1030113). > > regards > -mika- > > > _______________________________________________ > discuss mailing list > disc...@openvswitch.org > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss _______________________________________________ discuss mailing list disc...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
