linux-kernel - Re: [PATCH] e1000: Use deferrable timer for watchdog

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Message-ID: <82e4877d0712191139k4dbae463icf2a59c8c0104010@mail.gmail.com>
Date:	Wed, 19 Dec 2007 14:39:25 -0500
From:	"Parag Warudkar" <parag.warudkar@...il.com>
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org,
	"Arjan van de Ven" <arjan@...ux.intel.com>
Subject: Re: [PATCH] e1000: Use deferrable timer for watchdog

On 12/19/07, Kok, Auke <auke-jan.h.kok@...el.com> wrote:
[snip]

> I can't possibly see any benefit from this other than that you just add up to a
> whole second to the initialization cycle, which is bad.
>
Well, Ok but it can't be bad - I've been using this patch sometime and
haven't seen any problem at all and powertop shows it reduces the
wakeups-from-idle.

But whatever - no big deal since it already uses round_jiffies().

Parag

> >
> > Signed-off-by: Parag Warudkar <parag.warudkar@...il.com>
> >
> > --- linux-2.6/drivers/net/e1000/e1000_main.c    2007-12-07
> > 10:04:39.000000000 -0500
> > +++ linux-2.6-work/drivers/net/e1000/e1000_main.c    2007-12-18
> > 20:38:38.000000000 -0500
> > @@ -1030,7 +1030,7 @@
> >      adapter->tx_fifo_stall_timer.function = &e1000_82547_tx_fifo_stall;
> >      adapter->tx_fifo_stall_timer.data = (unsigned long) adapter;
> >
> > -    init_timer(&adapter->watchdog_timer);
> > +    init_timer_deferrable(&adapter->watchdog_timer);
> >      adapter->watchdog_timer.function = &e1000_watchdog;
> >      adapter->watchdog_timer.data = (unsigned long) adapter;
> >
> > --
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>
>
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