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From: Richard Weinberger <richard@nod.at>
To: dedekind1@gmail.com
Cc: axboe@fb.com, linux-kernel@vger.kernel.org,
	Christoph Hellwig <hch@infradead.org>,
	linux-mtd@lists.infradead.org,
	ezequiel.garcia@free-electrons.com, computersforpeace@gmail.com,
	dwmw2@infradead.org
Subject: Re: [PATCH] UBI: Block: Add blk-mq support
Date: Fri, 07 Nov 2014 10:53:37 +0100	[thread overview]
Message-ID: <545C96A1.40304@nod.at> (raw)
In-Reply-To: <1415353596.958.302.camel@sauron.fi.intel.com>

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.

Thanks,
//richard

WARNING: multiple messages have this Message-ID (diff)
From: Richard Weinberger <richard@nod.at>
To: dedekind1@gmail.com
Cc: Christoph Hellwig <hch@infradead.org>,
	axboe@fb.com, ezequiel.garcia@free-electrons.com,
	dwmw2@infradead.org, computersforpeace@gmail.com,
	linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] UBI: Block: Add blk-mq support
Date: Fri, 07 Nov 2014 10:53:37 +0100	[thread overview]
Message-ID: <545C96A1.40304@nod.at> (raw)
In-Reply-To: <1415353596.958.302.camel@sauron.fi.intel.com>

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.

Thanks,
//richard

  reply	other threads:[~2014-11-07  9:54 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-02 13:00 [PATCH] UBI: Block: Add blk-mq support Richard Weinberger
2014-11-02 13:00 ` Richard Weinberger
2014-11-02 21:52 ` Ezequiel Garcia
2014-11-02 21:52   ` Ezequiel Garcia
2014-11-02 22:21   ` Richard Weinberger
2014-11-02 22:21     ` Richard Weinberger
2014-11-02 22:27     ` Ezequiel Garcia
2014-11-02 22:27       ` Ezequiel Garcia
2014-11-02 22:49       ` Richard Weinberger
2014-11-02 22:49         ` Richard Weinberger
2014-11-03  1:20         ` Jens Axboe
2014-11-03  1:20           ` Jens Axboe
2014-11-03  1:18   ` Jens Axboe
2014-11-03  1:18     ` Jens Axboe
2014-11-03  5:03 ` Ming Lei
2014-11-03  5:03   ` Ming Lei
2014-11-03 13:58   ` Ezequiel Garcia
2014-11-03 13:58     ` Ezequiel Garcia
2014-11-03 18:22     ` Richard Weinberger
2014-11-03 18:22       ` Richard Weinberger
2014-11-03  8:18 ` Christoph Hellwig
2014-11-03  8:18   ` Christoph Hellwig
2014-11-03  8:23   ` Richard Weinberger
2014-11-03  8:23     ` Richard Weinberger
2014-11-07  9:46     ` Artem Bityutskiy
2014-11-07  9:46       ` Artem Bityutskiy
2014-11-07  9:53       ` Richard Weinberger [this message]
2014-11-07  9:53         ` Richard Weinberger
2014-11-07  9:56         ` Artem Bityutskiy
2014-11-07  9:56           ` Artem Bityutskiy

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