Hi. We faced similar issues during memory pressure. Some app leaked and caused intense swapping. You could check sar -B/sar -W if you have sysstat installed. WBR, Alexander Shevchenko
вс, 24 окт. 2021 г., 17:26 Christoph <[email protected]>: > Hello, > > we upgraded our debian BGP routers from debian buster to bullseye. > > On debian 10 they used the repo https://bird.network.cz/debian/ > now they use the bird2 package directly from the official debian repos, > both repos contain BIRD version 2.0.7. > > > After upgrading and rebooting we noticed that iBGP sessions are > constantly dying every few minutes. > > > The logs also show multiple of these log entries: > > <WARN> Kernel dropped some netlink messages, will resync on next scan. > <WARN> Event ... took 31415 ms > <WARN> I/O loop cycle took 31529 ms for 9 events > <WARN> Netlink: File exists > > > Especially the warning "Kernel dropped some netlink messages" was not > new but we previously solved them with these sysctl.conf settings: > > > # solves the "Kernel dropped some netlink messages, will resync on next > scan." BIRD Warnings > # https://bird.network.cz/pipermail/bird-users/2017-September/011542.html > # (we did not change the wmem_default since this is apparently not needed) > net.core.rmem_max=4194304 > net.core.rmem_default=4194304 > net.core.wmem_max=4194304 > > > The most obvious change is the linux kernel version: > 4.19.208 (buster) > 5.10.70 (bullseye) > > To avoid constantly dying iBGP sessions we increased the keepalive and > hold timers. > Are you observing similar issues on your debian 11 systems? > Does the newer kernel need higher rmem values? > > best regards, > Christoph >
