Subject: Re: [PATCH -rt DO NOT APPLY] Fix for tg3 networking lockup
From: "Michael Chan" <mchan@broadcom.com>
To: "David Miller" <davem@davemloft.net>
cc: herbert@gondor.apana.org.au, tytso@mit.edu, linux-kernel@vger.kernel.org,
       netdev@vger.kernel.org
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 <20060803235927.GB10932@gondor.apana.org.au>
 <20060803.170143.20633018.davem@davemloft.net>
Date: Thu, 03 Aug 2006 17:16:40 -0700
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On Thu, 2006-08-03 at 17:01 -0700, David Miller wrote:
> From: Herbert Xu <herbert@gondor.apana.org.au>
> Date: Fri, 4 Aug 2006 09:59:27 +1000
> 
> > Watchdogs usually require one heartbeat every 30 seconds or so.  Does
> > the ASF heartbeat need to be that frequent?
> 
> The ASF heartbeat needs to be sent every 2 seconds.
> 

Yep, we send it every 2 seconds and it will reset in 5 seconds after the
last heartbeat.  So the margin is 3 seconds.  These numbers are somewhat
arbitrary and the goal is to allow ASF to function properly without too
much delay after the system has crashed.

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