Re: [PATCH -rt DO NOT APPLY] Fix for tg3 networking lockup
From: David Miller
Date: Tue Aug 08 2006 - 17:57:58 EST
From: Steven Rostedt <rostedt@xxxxxxxxxxx>
Date: Tue, 8 Aug 2006 08:24:10 -0400 (EDT)
> Of the 4 timers, only one is a timeout. The other three expire every time,
> forcing the timer wheel into effect. Even though it's one timer
> implementing 4, it's expensive to use it as a watchdog.
It's not a watchdog, the timer continually fires.
It is the on-chip ASF firmware that "times out" if it does not
see the heartbeat message from the driver within 5 seconds.
The driver timer in question runs every 2 seconds to write this
heartbeat message to the chip.
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