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

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

--- Comment #44 from Martin Birgmeier <d8zNeCFG@aon.at> ---
Here the latest results, all machines running stable/14 @ 4e8444d5750a with
minor local patches. The first set is for the driver from ports, the second for
that from stable/14. In summary, the issue seems solved, the speeds are even
significantly better for incoming NFS and otherwise similar.

Thank you for the work, which commit was responsible for resolving this?

-- Martin

if_em_updated_load="YES"
------------------------

from this machine to the 100 Mbit machine: 312886272 bytes in  29.55 s = 10.59
Mbyte/s
from this machine to the 1 Gbit machine: 312886272 bytes in 6.295 s = 49.70
Mbyte/s

from the 100 Mbit machine to this machine: 391778530 bytes in 37.105 s = 10.56
Mbytes/s
from the 1 Gbit machine to this machine: 391413991 bytes in 15.556 s = 25.16
Mbytes/s

from the 100 Mbit machine to a stable/14 running in a VirtualBox on this
machine: 327977408 butes in 31.119 s = 10.54 Mbytes/s
from the 1 Gbit machine to a stable/14 running in a VirtualBox on this machine:
327977408 bytes in 15.309 s = 21.42 Mbyte/s

if_em_load="YES"
----------------

from this machine to the 100 Mbit machine: 312886272 bytes in 29.293 s = 10.68
Mbyte/s
from this machine to the 1 Gbit machine: 312886272 bytes in 5.906 s = 52.98
Mbyte/s

from the 100 Mbit machine to this machine: 327977408 bytes in 30.775 s = 10.66
Mbyte/s
from the 1 Gbit machine to this machine: 327977408 bytes in 5.814 s = 56.41
Mbyte/s <=== significantly better

from the 100 Mbit machine to a stable/14 running in a VirtualBox on this
machine: 327977408 bytes in 31.728 s = 10.34 Mbytes/s
from the 1 Gbit machine to a stable/14 running in a VirtualBox on this machine:
327977408 bytes in 6.599 s = 49.70 Mbytes/s <=== significantly better

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