kern/118093: firewire bus reset hogs CPU, causing data to be lost

[Dieter]

> Looks like the kernel printf takes a *lot* of CPU, and
> somehow locks out Ethernet.

Looking through man pages working on an unrelated problem, I found:

man timed says:

     Messages printed by the kernel on the system console occur with inter-
     rupts disabled.  This means that the clock stops while they are printing.
     A machine with many disk or network hardware problems and consequent mes-
     sages cannot keep good time by itself.  Each message typically causes the
     clock to lose a dozen milliseconds.

If a kernel printf disables Ethernet interrupts for 12 milliseconds,
that would create the problem.