Re: [PATCHv2 05/14] libata: NCQ Encapsulation for READ LOG DMA EXT

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Hello, Hannes.

On Thu, Apr 14, 2016 at 07:44:19AM +0200, Hannes Reinecke wrote:
> Hehe. No, it isn't, if you look closely.
> (Or make that: it _shouldn't_, and I've messed it up)
> (That's what the 'fpdma' parameter is for)
> 
> The benefit is not so much for normal operations, but it'll give us
> a performance improvements on SMR drives where we need to issue
> READ LOG DMA EXT rather frequently. There we really want to have
> them as NCQ commands.

I'm still a bit confused.  Isn't it part of EH?  If so, the path is
never traveled with other commands in flight and thus whether a
command is NCQ or not doesn't make any difference.  The only thing
it'd do is making devices which advertise the capability but don't get
it quite right fail.

Thanks.

-- 
tejun
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