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Message-ID: <20071217090000.64499fba@deepthought> Date: Mon, 17 Dec 2007 09:00:00 -0800 From: Stephen Hemminger <shemminger@...ux-foundation.org> To: Eric Dumazet <dada1@...mosbay.com> Cc: "parag.warudkar@...il.com" <parag.warudkar@...il.com>, linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: init_timer_deferrable conversion On Mon, 17 Dec 2007 15:29:43 +0100 Eric Dumazet <dada1@...mosbay.com> wrote: > On Mon, 17 Dec 2007 09:55:04 +0100 > Eric Dumazet <dada1@...mosbay.com> wrote: > > > On Sun, 16 Dec 2007 22:00:23 -0500 (EST) > > Parag Warudkar <parag.warudkar@...il.com> wrote: > > > > > In my quest to get the wake-ups from idle per second down to bare minimum, > > > I noticed 3 places in the kernel that could benefit from > > > using init_timer_deferrable() instead of init_timer() - > > > > > > a) drivers/net/sky2.c - watchdog_timer. This was showing up high on > > > Powertop's list of things that cause routine wakeups from idle. After > > > converting to init_timer_deferrable() the wakeups went down and this one > > > no longer shows up in powertop's list. 25% reduction. This surprises me because it is a 1 hz timer and uses round_jiffies() in the current kernel. -- Stephen Hemminger <shemminger@...ux-foundation.org> -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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