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

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

--- Comment #10 from Eugene Grosbein <eugen at freebsd.org> ---
(In reply to Martin Birgmeier from comment #9)

>I added hw.pci.enable_msi=0 to /boot/loader.conf, which was a bad idea, because with this, after loading the kernel, the system does not find ada0 anymore.

That's why I suggested to use loader prompt. Next time, if you need to test
something like this and cannot use loader prompt directly, use nextboot(8)
feature that guarantees safe fallback to known working configuration even if
boot is broken during experiment: you add "hw.pci.enable_msi=0" (or another
setting) to /boot/nextboot.conf that is created with nextboot(8) command and
loader uses nextboot.conf for one time only ignoring it for successive loading
attempts and nextboot.conf is removed completely during first successfull boot.

You can even change root file system name, kernel name or set of loaded kernel
modules using nextboot safely.

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