NFS + Infiniband problem

[Andrew Vylegzhanin]

чт, 1 нояб. 2018 г. в 3:27, Rick Macklem <rmacklem at uoguelph.ca>:

> >Also need to test setup with infniband set from connected mode to
datagram mode.
> Are you using IPv6 by any chance?

No, I don't.

> Why I ask is that there was a problem with IPv6 fragmentation
re-assembly. If
> InfiniBand is using a larger MTU than the ethernet, the switch would
probably
> fragment the IP datagram. If any fragment is lost (or fragmentation
re-assembly
> is broken), it isn't going to work well.
> "netstat -s | fgrep "fragments dropped after"

[root at nas1 ~]# netstat -s | fgrep "fragments dropped after"
           0 fragments dropped after timeout
           0 fragments dropped after timeout

> will show you the count of fragments dropped after timeout. If this value
is
> increasing, then fragmentation re-assembly is an issue. (Check on the
receiving
> end. The server for writes.)
>

> You might want to post on freebsd-net@, since someone there might know
more
> about InfiniBand (and someone over there will definitely know about the
IPv6
> fragmentation problem.

I'm cc'ed to freebsd-infiniband@ also, but silence.

>
> rick

--
Andrew