So it was a painful issue, caused by the rtnl_route_alloc_cache() call in... NetworkManager. Passing NL_AUTO_PROVIDE as a flag for the cache creation causes issues, switching that to no flags (0) fixes the issue.
** Changed in: libnl3 (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/856333 Title: (oneiric) wired connection unnaturally slow To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/856333/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs