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

[bugzilla-noreply at freebsd.org]

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

Eugene Grosbein <eugen at freebsd.org> changed:

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                 CC|                            |eugen at freebsd.org

--- Comment #5 from Eugene Grosbein <eugen at freebsd.org> ---
The problem may be related to interrupt handling and/or timekeeping.

1) Do you run ntpd there? If yes, show contents of /var/db/ntpd.drift. If not,
start it, make sure it synced time successfully (ntpq -np), wait an hour and
show /var/db/ntpd.drift.

2) Show output of sysctl kern.timecounter and sysctl kern.eventtimer commands.
If kern.eventtimer.periodic is 0, set it to 1 and repeat your tests and post
results.

3) Show output of "grep irq /var/run/dmesg.boot" for 12.0 and use 11.2 live
boot media (flash stick or CD/DVD) and repeat "grep irq /var/run/dmesg.boot",
save output and post it too.

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