[Bug 1912331] Re: Many interfaces lead to "kernel receive buffer overrun"

[André Hänsel]

I don't completely understand it myself.

I have a Focal system with k3s installed and about 70 pods (about 150
containers) and about 70 veth devices.

In /lib/systemd/system/systemd-networkd.socket under "[Socket]" I have
set "ReceiveBuffer=128M".

Maybe that "128M" isn't enough but I can't add any more pods without
getting "Could not enumerate addresses: No buffer space available"
errors, so I *assumed* there's more to that patch than just the
ReceiveBuffer setting.

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Title:
  Many interfaces lead to "kernel receive buffer overrun"

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  Won't Fix
Status in systemd source package in Groovy:
  Fix Released

Bug description:
  This is about a systemd-networkd bug, described here:

  https://github.com/systemd/systemd/issues/14417

  There's a patch available:

  https://github.com/systemd/systemd/pull/16982

  Can this be backported to Focal?

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