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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH -rt DO NOT APPLY] Fix for tg3 networking lockup
Date: Sun, 06 Aug 2006 23:18:46 -0700 (PDT)
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From: Steven Rostedt <rostedt@goodmis.org>
Date: Mon, 7 Aug 2006 01:34:56 -0400 (EDT)

> My suggestion would be to separate that tg3_timer into 4 different
> timers, which is what it actually looks like.

Timers have non-trivial cost.  It's cheaper to have one and
vector off to the necessary operations each tick internalls.

That's why it's implemented as one timer.