linux-kernel - Re: [PATCH 1/2] Define sysfs interfaces for ibmaem driver

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Message-ID: <20080401084747.GE7183@tree.beaverton.ibm.com>
Date:	Tue, 1 Apr 2008 01:47:47 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	"Mark M. Hoffman" <mhoffman@...htlink.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	lm-sensors <lm-sensors@...sensors.org>
Subject: Re: [PATCH 1/2] Define sysfs interfaces for ibmaem driver

[Got in a car accident tonight; replies will be scarce for the next week
or two.... :(]

On Tue, Apr 01, 2008 at 10:22:28AM +0200, Jean Delvare wrote:

> OK. Another question that comes to my mind now is the unit... Do the
> chips express the value in Joules internally? I would have expected
> Watt-hours. Of course we can convert as needed, but if all known chips
> use the same unit then I think we should that unit too, to minimize the
> required conversions.

The IBM chips report some form of Joules, not Wh.

> It really depends on what the chips report. Typically the drivers
> should report the values from the chip without too much tinkering
> (other than conversion to standard units). If some chips can report
> both "instantaneous" and "average" power uses, it makes sense to have
> both sets of filenames in the standard interface. If not then I am fine
> getting rid of one set.

Hmm, I'll think about what I want to do with this.  Probably just leave
them.

> I don't think there is any precedent yet. I suggested this for
> unambiguity rather than consistency.

Ok.

> Oh well, I guess that anything shorter than 1 ms can be considered
> "instantaneous power use", so we can go with millisecond.

Ok.

> Out of curiosity, what are the values supported by the ibmaem chip?

I don't know what the lower limits are; it depends on how often the BMC
decides to update the counters, and that seems to vary by machine.

--D
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