Re: [RFC] MMC-4.5 Context ID

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On 5 February 2012 08:15, Chris Ball <cjb@xxxxxxxxxx> wrote:
> Hi,
>
> On Wed, Feb 01 2012, Saugata Das wrote:
>> From: Saugata Das <saugata.das@xxxxxxxxxx>
>>
>> This patch groups the read or write transfers to eMMC in different contexts
>> based on the block number. Transfers to consecutive blocks are grouped to a
>> common context. So several small transfers combine to give performance like
>> a large multi block transfer.
>>
>> The patch creates a context of 1MB multiple in non-large unit mode. Reliable
>> mode is enabled in the context based on whether reliable write is enabled.
>
> Do you see any performance changes with this patchset?  If so, can you
> give details?

I do not see any performance impact (positive or negative) on the
sample eMMC-4.5 device which I have. This could be due to the slow
bridge which I use (1-bit mode at 25MHz) to connect the eMMC-4.5
device on micro-SD slot of 8500 platform.

>
> Thanks,
>
> - Chris.
> --
> Chris Ball   <cjb@xxxxxxxxxx>   <http://printf.net/>
> One Laptop Per Child
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