linux-kernel - Re: [PATCH] UBI: Block: Add blk-mq support

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Message-ID: <1415354191.958.307.camel@sauron.fi.intel.com>
Date:	Fri, 07 Nov 2014 11:56:31 +0200
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Richard Weinberger <richard@....at>
Cc:	Christoph Hellwig <hch@...radead.org>, axboe@...com,
	ezequiel.garcia@...e-electrons.com, dwmw2@...radead.org,
	computersforpeace@...il.com, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] UBI: Block: Add blk-mq support

On Fri, 2014-11-07 at 10:53 +0100, Richard Weinberger wrote:
> Am 07.11.2014 um 10:46 schrieb Artem Bityutskiy:
> > On Mon, 2014-11-03 at 09:23 +0100, Richard Weinberger wrote:
> >> Am 03.11.2014 um 09:18 schrieb Christoph Hellwig:
> >>> On Sun, Nov 02, 2014 at 02:00:55PM +0100, Richard Weinberger wrote:
> >>>> +#define UBIBLOCK_SG_COUNT 64
> >>>
> >>>
> >>> Can you document why you choose this number? The default nr_request
> >>> for the old code would be 128.
> >>
> >> Is 64 a problem? Beside of the fact that I forgot to set blk_queue_max_segments().
> >> I used this number because 128 seemed a bit high and my goal was to
> >> keep the memory footprint small.
> >> This is also why I've set tag_set.queue_depth to 64.
> > 
> > The request was to document, so lets' document the choice.
> 
> Of course I'll document it. But so far I had no time to do a
> v2 of this patch.

Your reply just sounded like you are complaining to the request (starts
with "is this a problem?"). And it looked like you try to defend the 64
choice, while no one challenged it.

So my e-mail is to just kindly help you by pointing that the request was
to only add a piece of doc so far, in case you misinterpreted it.

Artem.

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