[Bug 235031] [em] em0: poor NFS performance, strange behavior

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 12 Mar 2022 22:05:27 UTC

David O'Rourke <dor.bsd@xm0.uk> changed:

           What    |Removed                     |Added
                 CC|                            |dor.bsd@xm0.uk

--- Comment #41 from David O'Rourke <dor.bsd@xm0.uk> ---

Just noticed really bad NFS client performance on em0 on my 13.0-RELEASE-p4
server recently. It's likely been broken for a long time, but I don't use the
NFS client functionality much (I haven't needed to read/write something over it
in a few years, previously it worked perfectly).  I noticed it because that was
about to change, and the NFS client was going to become more important.

I can't get more than about 180KiB/s over NFS at the moment. I haven't tried
the intel-em-kmod drivers yet, but I probably will tomorrow (it's late here at
the moment).

The remote NFS server is fine and performs as it should, it can kick out around
1Gbit/s to other (non-FreeBSD) machines no problem.

It should also be noted that in at least my case, the NFS server on this
FreeBSD machine continues to work just fine, and I can read/write to it at the
speed of the network. The poor performance is strictly limited to just the

I don't really have anything else to contribute, and added this information
just to check that someone knows that this is still a problem.


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