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

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

--- Comment #15 from Eugene Grosbein <eugen at freebsd.org> ---
(In reply to Martin Birgmeier from comment #13)

> What can you get from the ntp drift?

Now we see this machine has good enough hardware timer to rule out problems
linked with bad hardware timer.

> Is there a way to selectively disable MSI for em0 only?

No, driver does not support that.

However, you have cpufreq enabled so the box may run with lower CPU frequency
unless there is something like iperf running making extra load. Can you
temporary configure system to run at max all the time or just unload cpufreq
and repeat your tests?

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