On Tue, 20 Feb 2001, Alan Cox wrote:
> > i dont like this one. 100 times a second makes absolutely no performance
> > difference whatsoever - but eg. i'm driving kernel profiling from the NMI
> > handler to get profiles of eg. IRQ handlers and other cli()-ed code areas.
>
> So set it to 100Hz as a debugging option like slab debugging
my major gripe right now is that we still have bug reports that say that
systems hang when using nmi_watchdog=1 and work if nmi_watchdog=0.
Changing the NMI watchdog to be 1 Hz will make these bugreports "Linux
hangs once a week" instead of a "Linux hangs after 1-2 hours", which is
clearly hiding things and making debugging harder.
(and driving kernel-profiling from the NMI interrupt is a short-term
patch, so there is just no point in going to 1 Hz right now just to go
back to 100 Hz a few days later.)
the rest of the changes are excellent - it's only the 100 Hz NMI issue i
have a problem with.
Ingo
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This archive was generated by hypermail 2b29 : Fri Feb 23 2001 - 21:00:23 EST