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

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235031

--- Comment #16 from Martin Birgmeier <d8zNeCFG at aon.at> ---
In the tcpdump log shown in comment #4 it seems that there is always a lot of
traffic in one direction followed by a lot of ACKs in the other (if I interpret
it correctly).

Could it be that something is buffering too many packets, thereby destroying
NFS "streaming"?

What about this strange "em0: TX(0) desc avail = 1024, pidx = 0" error in
comment #2 when I tried to set -rxcsum? Does it mean that there are 1024
buffers available?

-- Martin

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