linux-kernel - Re: [Discuss] [PATCH] ipmi: use round_jiffies on timers to reduce timer overhead/wakeups

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Message-ID: <4ADF75A2.50202@linux.intel.com>
Date:	Thu, 22 Oct 2009 05:57:06 +0900
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Corey Minyard <minyard@....org>
CC:	Randy Dunlap <randy.dunlap@...cle.com>,
	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	"discuss@...sWatts.org" <discuss@...sWatts.org>,
	"openipmi-developer@...ts.sourceforge.net" 
	<openipmi-developer@...ts.sourceforge.net>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [Discuss] [PATCH] ipmi: use round_jiffies on timers to reduce
 timer overhead/wakeups

Corey Minyard wrote:
> Certainly.  Yes, some (probably most) IPMI hardware does not use
> interrupts, and unfortunately, it's not just older machines.  The driver
> used to poll more slowly, but in many cases the performance was
> unacceptable.

... but now it burns quite a bit of power (I'd not be surprised if it is 10 Watts extra on a 70W server)

is there any way to poll slowly until there is active ipmi traffic, during which we can then poll a bit faster.
... and then go back to slow polling when there is an ipmi idle period ?
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