Messages in this thread | | | Subject | Re: i386 nmi_watchdog: Merge check_nmi_watchdog fixes from x86_64 | From | (Eric W. Biederman) | Date | Wed, 05 Oct 2005 14:00:48 -0600 |
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Bill Davidsen <davidsen@tmr.com> writes:
> Eric W. Biederman wrote: >> The per cpu nmi watchdog timer is based on an event counter. idle cpus don't >> generate events so the NMI watchdog doesn't fire >> and the test to see if the watchdog is working fails. > > Question: given all the concern about reducing clocks and all, do we actually > need nmi on more than one CPU? Are there cases where a single CPU hangs in idle > on an SMP system?
I really don't know, but the normal interrupt rate is once per second or slower if the cpu is idle. I was just working in the vicinity and discovered when I enabled the nmi watchdog it failed to come on because it didn't handled it's initialization test properly, and x86_64 had already fixed it.
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