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Date:      Sat, 12 Mar 2022 22:05:27 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 235031] [em] em0: poor NFS performance, strange behavior
Message-ID:  <bug-235031-7501-560EYTAvXd@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-235031-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-235031-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D235031

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> ---
Hi,

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 t=
he
NFS client functionality much (I haven't needed to read/write something ove=
r 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 ar=
ound
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
client.

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.

Cheers,
-David

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