On 2016-09-19 3:28 pm, Lyndon Nerenberg wrote:
This is almost certainly a PMTUd issue.
Unless your end-to-end paths to everything you talk to have
jumboframes configured, there's no benefit to setting them up on the
lagg. Just go with the default MTU.
Everything on physical Ethernet has support for it Including the LAN
interface of Firewall, and talks to it just fine over a single interface
with Jumbo frames enabled. Just when I introduced the LAGG interface
other devices with Jumbo frames enabled stopped talking. I was trying to
speed up my backups (Bacula runs on one of the jails, NAT Reflection
isn't used for the Bacula services) which take about 7.5 hours over a
single interface to complete on the weekly fulls, I Have two
simultaneous jobs running at the start, and I was hoping that the LAGG
would speed them up, but I suspect the loss of Jumbo frames on the
transfer would be slower than the single interface. Its also possible it
won't have an impact either way and the disk write is the bottle neck.
The 930G written in during the backup is the only network load I have
that is pushing the network anywhere close to a heavy load.
FYI I do have net.inet.tcp.pmtud_blackhole_detection enabled on the
Dean E. Weimer
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