04.09.2018 23:57, Ryan Moeller wrote: >> The NIC's are Intel based using igb kernel driver: >> >> igb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9000 >> options=6403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6> > > I see your MTU is 9000, and as described by the other thread you linked to, > there are issues with 9k jumbo cluster allocation. > Some detailed notes are here, but the quick summary is: set MTU < 4096 > https://gist.github.com/freqlabs/eba9b755f17a223260246becfbb150a1 > >> Can anyone suggest anything to stop my system from completely locking up and >> becoming unresponsive? >> At the moment I'm not sure if switching to 'Stable' or 'Current' branches is >> a good solution? > > The problem has been mitigated for a while on 12-CURRENT, so that might be > worth trying. Otherwise I’ve been hoping a committer will put this fix in > 11-STABLE, but in the meantime you could manually apply the patch: > https://reviews.freebsd.org/D16534 <https://reviews.freebsd.org/D16534>
Intel NIC users also should be aware of chip hardware problems while dealing with 9k MTU, like documented here: https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/i218-i219-ethernet-connection-spec-update.pdf In short, Intel does not recommend MTU over 8500. _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
