Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030278AbWHHWAG (ORCPT ); Tue, 8 Aug 2006 18:00:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030283AbWHHWAF (ORCPT ); Tue, 8 Aug 2006 18:00:05 -0400 Received: from dsl027-180-168.sfo1.dsl.speakeasy.net ([216.27.180.168]:44717 "EHLO sunset.davemloft.net") by vger.kernel.org with ESMTP id S1030278AbWHHWAC (ORCPT ); Tue, 8 Aug 2006 18:00:02 -0400 Date: Tue, 08 Aug 2006 15:00:06 -0700 (PDT) Message-Id: <20060808.150006.48399434.davem@davemloft.net> To: rostedt@goodmis.org Cc: tytso@mit.edu, mchan@broadcom.com, herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, tglx@linutronix.de, mingo@elte.hu Subject: Re: [PATCH -rt DO NOT APPLY] Fix for tg3 networking lockup From: David Miller In-Reply-To: References: <20060806.231846.71090637.davem@davemloft.net> X-Mailer: Mew version 4.2 on Emacs 21.4 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 805 Lines: 19 From: Steven Rostedt 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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/