[Bug 225535] Delays in TCP connection over Gigabit Ethernet connections; Regression from 6.3-RELEASE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225535

--- Comment #20 from Aleksander Derevianko <aeder at list.ru> ---
Now with em0 devices:

A1 computer:
root at fspa1:~/clock/new_res # grep times periodic_em0.txt | awk '{print $3 " "
$4 " " $6 " " $8 " " $10;}' | sort | uniq -c
11256 send_sync 0 0 0 0
10968 send_sync 0 0 0 1
 234 send_sync 0 1 0 0
   1 send_sync 0 1 0 1

A2 computer:
root at fspa2:~/clock/new_res # grep times periodic_em0.txt | awk '{print $3 " "
$4 " " $6 " " $8 " " $10 ;}' | sort | uniq -c
18284 send_sync 0 0 0 0
2490 send_sync 0 0 0 1
1704 send_sync 0 1 0 0


Current results seems just fine. I think, rare delays for 230ms in previous
tests is actually Realtec card problems. It's cheap TP-Link TG-3468 device, so
if it will continue to work fine with build-in em0 I will consider problem
solved. 

Actual solutions seems to be 
kern.eventtimer.periodic=1

I will try to set only 
kern.eventtimer.periodic=1 
and 
kern.timecounter.alloweddeviation=0 
parameters, leaving everything else to system defaults.

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