Re: [PATCH RFC v2] support SATA ODD zero power

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Hi Tejun, 

Nice can talk with you! :-)

æ äï2010-12-08 æ 18:25 +0100ïTejun Heo æåï
> (cc'ing linux-ide)
> 
> Hello,
> 
> On 12/08/2010 04:36 PM, Joey Lee wrote:
> > Dear all expert, 
> > 
> > Hi, m... I just google the SATA ODD zero power support and found Henry
> > already contribute the patch:
> > 
> >  http://kerneltrap.org/mailarchive/linux-scsi/2010/6/25/6885558
> > 
> > And, after first round review, 
> > The second version is here:
> >  http://www.spinics.net/lists/linux-scsi/msg44925.html
> > 
> > But, I didn't see this patch merged in kernel maintain, does there have
> > any problem with this patch? or actually the patch already in queue
> > waiting to merge to mainline?
> > 
> > I appreciate if can have any comment to me.
> 
> IIRC, at the time, the problem was that nobody had the hardware and
> the implementation was solely based on the specification only.  I
> didn't want it to go in without any actual testing, so it was put on
> hold for the time being.  Do you have access to a device with zsero
> power support?  If so, are you willing to test the implementation?
> 

Got it!
I will do the testing if I get hardware can support this function.

> Hmmm... at the same time, I'm a little bit doubtful about its
> usefulness.  How much power does it save?  Furthermore, ODDs are often

I am not sure how many watts can be save, it's need use 2-channel power
meter or NetDAQ to verify. I know how to do that, just need the sample
machine.

> omitted on mobile devices these days.  So, I have a slight reluctance
> against including it but if the implementation is clean enough and
> there is enough benefits it shouldn't be too difficult to overcome.

Fully understood!


Thank's a lot!
Joey Lee

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