We have a network appliance that is currently based on 4.9. We are in
the process of releasing
a new version based on 6.1 stable.

In our testing using nttcp thru the appliance we see insignifant
difference in thruput between the 2
versions in a controlled environment - aproximately 94mbs on a 100mb lan.

Are there any sysctl tunables that may affect performance going over the
internet
with a slower link, dropped packets, etc that could cause this?

Have you tried

options         DEVICE_POLLING

in the kernel? If you want to try yuo can find a section in the file
NOTES located the same place as your kernel.

Is the kernel cusomized? Have you enabled -O2 as optimization? Do you
consider release 6.2 rather than 6.1?

--
regards
Claus

When lenity and cruelty play for a kingdom,
the gentlest gamester is the soonest winner.

Shakespeare
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