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

[Namjae Jeon]

Hi. Seungwon,

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

Thanks.


2012/1/20 Kyungmin Park <kmpark@xxxxxxxxxxxxx>:
> 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@xxxxxxxxxxx>
>
> On 1/20/12, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
>> This patch-set adds support of packed command feature
>> for eMMC4.5 devices.
>>
>> Changes in v3:
>> Â Â Â - Add a variable member in mmc_host for minimum number of packed entries.
>> Â Â Â Â This value can be overrided by host.
>> Â Â Â - Fix a handling of error sequence.
>>
>> Changes in v2:
>> Â Â Â - Fix the packed read sequence and error handling.
>> Â Â Â - Apply checking the exception status for all cases with
>> Â Â Â Â the comments from Maya Erez and Sahitya Tummala.
>> Â Â Â - Fix preparing the packed list with the comment from Maya Erez and
>> Venkatraman.
>>
>>
>> Seungwon Jeon (2):
>> Â Â Â mmc: core: Add packed command feature of eMMC4.5
>> Â Â Â mmc: core: Support packed command for eMMC4.5 device
>>
>> Âdrivers/mmc/card/block.c  | Â469
>> +++++++++++++++++++++++++++++++++++++++++---
>> Âdrivers/mmc/card/queue.c  |  48 +++++-
>> Âdrivers/mmc/card/queue.h  |  13 ++
>> Âdrivers/mmc/core/host.c  Â|  Â2 +
>> Âdrivers/mmc/core/mmc.c   |  24 +++
>> Âdrivers/mmc/core/mmc_ops.c | Â Â1 +
>> Âinclude/linux/mmc/card.h  |  Â3 +
>> Âinclude/linux/mmc/core.h  |  Â3 +
>> Âinclude/linux/mmc/host.h  |  Â4 +
>> Âinclude/linux/mmc/mmc.h  Â|  15 ++
>> Â10 files changed, 555 insertions(+), 27 deletions(-)
>>
>> Best regards,
>> Seungwon Jeon.
>> --
>> 1.7.2.3
>>
>>
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