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

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Date:	Fri, 07 Nov 2014 11:46:36 +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 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.

Artem.

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