Re: [RFC] MMC-4.5 Context ID

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On 02/06/2012 02:13 PM, Saugata Das wrote:

> 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.

I think that should be increased the performance by how we select the context.
I also didn't see any performance benefit..8-bit mode at 50Mhz.
But i have interest for this feature

Best Regards,
Jaehoon Chung

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