Hello Miroslav,
That NIC and driver are solid in my experience, so I'd suspect an
issue with the system clock.
Check current and available clocksources:
cat /sys/devices/system/clocksource/clocksource0/current_clocksource
cat /sys/devices/system/clocksource/clocksource0/available_clocksource
and try switching to a different clocksource, e.g.
echo hpet > /sys/devices/system/clocksource/clocksource0/current_clocksource
The available clocks in such path were tsc itself and acpi_pm. I do not
jave "hpet". I changed it for acpi_pm and the results are equal. It
appears the message "clockcheck: clock jumped backward or runnin slower
than expected!". Then the slave port change from slave to uncalibrated.
It tries to synchronize to the GM a little more and then it converts
into master.
I tried the test with a normal kernel without Preemp_RT patch and the
same results are.
Diego
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