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Message-id: <4A154AEF.506@acm.org>
Date: Thu, 21 May 2009 07:37:03 -0500
From: Corey Minyard <minyard@acm.org>
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To: Ferenc Wagner <wferi@niif.hu>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       openipmi-developer@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: [Openipmi-developer] modprobe ipmi_si hangs under 2.6.30-rc5
References: <87tz3qnh7o.fsf@tac.ki.iif.hu>
 <20090516170959.8057c9e4.akpm@linux-foundation.org>
 <877i0eqpss.fsf@tac.ki.iif.hu> <20090518184053.GA24134@minyard.local>
 <87iqjxzjz4.fsf@tac.ki.iif.hu> <4A1326C5.4010308@acm.org>
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Ferenc Wagner wrote:
> Corey Minyard <minyard@acm.org> writes:
>
>   
>> Ferenc Wagner wrote:
>>
>>     
>>> Just out of interest, how often does the driver wake up to check
>>> the inteface?
>>>       
>> When idle, the driver wakes up every 10ms to check for something on
>> the driver.
>>     
>
> Wow, 100 times per second, that sure sounds gross for piping out SEL
> entries!  Though it certainly doesn't matter much for our servers, but
> hasn't it got the potential to heavily tax laptop batteries?  Or is
> that why ipmi_si isn't loaded automatically by udev?
>   
IPMI is used for a lot of things beyond just getting SEL entries.  I 
some cases (probably most) it's excessive, in others it's not.

However, AFAIK IPMI hardware is only available in server systems.  I 
don't think it's ever been used in a laptop.

-corey