linux-kernel - Re: [PATCH v3 0/2] mmc: core: Support packed command feature of eMMC4.5

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Date:	Fri, 20 Jan 2012 14:39:54 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	Seungwon Jeon <tgih.jun@...sung.com>
Cc:	linux-mmc@...r.kernel.org, Chris Ball <cjb@...top.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/2] mmc: core: Support packed command feature of eMMC4.5

Hi. Seungwon,

Would you show improved performance measurement
result(read/write,seq,ran) when using packed cmd ?

Thanks.


2012/1/20 Kyungmin Park <kmpark@...radead.org>:
> Hi,
>
> FYI: we get performance gain using packed command at write. however in
> case of small size read, there are some performance drop since
> protocol overhead.
> In normal case, read command uses read operation only, but in case of
> packed read. It sends the command to eMMC and read it.
> Anyway it's good feature for eMMC v4.5.
>
> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
>
> On 1/20/12, Seungwon Jeon <tgih.jun@...sung.com> wrote:
>> This patch-set adds support of packed command feature
>> for eMMC4.5 devices.
>>
>> Changes in v3:
>>       - Add a variable member in mmc_host for minimum number of packed entries.
>>         This value can be overrided by host.
>>       - Fix a handling of error sequence.
>>
>> Changes in v2:
>>       - Fix the packed read sequence and error handling.
>>       - Apply checking the exception status for all cases with
>>         the comments from Maya Erez and Sahitya Tummala.
>>       - Fix preparing the packed list with the comment from Maya Erez and
>> Venkatraman.
>>
>>
>> Seungwon Jeon (2):
>>       mmc: core: Add packed command feature of eMMC4.5
>>       mmc: core: Support packed command for eMMC4.5 device
>>
>>  drivers/mmc/card/block.c   |  469
>> +++++++++++++++++++++++++++++++++++++++++---
>>  drivers/mmc/card/queue.c   |   48 +++++-
>>  drivers/mmc/card/queue.h   |   13 ++
>>  drivers/mmc/core/host.c    |    2 +
>>  drivers/mmc/core/mmc.c     |   24 +++
>>  drivers/mmc/core/mmc_ops.c |    1 +
>>  include/linux/mmc/card.h   |    3 +
>>  include/linux/mmc/core.h   |    3 +
>>  include/linux/mmc/host.h   |    4 +
>>  include/linux/mmc/mmc.h    |   15 ++
>>  10 files changed, 555 insertions(+), 27 deletions(-)
>>
>> Best regards,
>> Seungwon Jeon.
>> --
>> 1.7.2.3
>>
>>
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