linux-kernel - Re: [patch 2/4] Expose Power Management Policy option to users

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Date:	Wed, 01 Aug 2007 12:24:44 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
CC:	Jeff Garzik <jeff@...zik.org>, James.Bottomley@...eleye.com,
	linux-scsi@...r.kernel.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	edwintorok@...il.com, axboe@...nel.dk
Subject: Re: [patch 2/4] Expose Power Management Policy option to users

Kristen Carlson Accardi wrote:
>> I don't think the interface you're suggesting is a good one.  Do you?
> 
> I think if it's applicable to SCSI at all it is fine.  If it is not, then
> I think we need to make do with the interface we are given.  I do not think
> we should hold up a feature for libata sysfs integration.

Well, I guess we'll have to agree to disagree here and leave the
decision to James and Jeff.

>>> I can assert that I think ALPM is a good idea,
>>> because I've never had a report of it causing problems.  Windows has 
>>> been using this feature for a very long time - and you have to admit that
>>> they have a pretty large market share.  Nobody is complaining about ALPM
>>> increasing device malfunction, so unless you have proof it seems insane
>>> to nak due to this. 
>> Is ALPM enabled by default?  How do they deal with the performance
>> degradation?
> 
> I believe so, but I'm obviously not privvy to their implementation details.

It would be *really* great if we can find more about how they do it.
How and when it's enabled and on which systems.  Is it possible to find
this out?

-- 
tejun
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