Hi A..
I tested your patch..(using CMD23)
my environment is the below.
eMMC card : Sandisk SEM8G (eMMC 4.3+)
buswidth : 4bit (SDR)
AP : C110
benchmark : IOzone
I want to know how do you think about this result?
(i can't see your results)
* open-ended
KB reclen write rewrite read reread
10240 4 9128 9859 18072 18131
10240 8 9510 10025 18107 18031
10240 16 9445 10104 18143 18084
10240 32 9583 10076 17912 18097
10240 64 2957 3025 12320 12317
10240 128 9500 9850 18082 18085
10240 256 9506 8712 17952 17905
10240 512 9445 9905 17981 17851
10240 1024 8894 9724 18079 18196
10240 2048 9401 9810 18181 18040
10240 4096 8657 9358 18172 17980
10240 8192 8779 7730 18067 17943
* pre-defined (CMD23)
KB reclen write rewrite read reread
10240 4 8799 8061 18069 18212
10240 8 8850 8465 17938 18084
10240 16 8077 9171 18131 18249
10240 32 8810 8209 18019 17999
10240 64 8744 8214 18096 18204
10240 128 7940 10041 18036 18043
10240 256 8466 7557 18101 18186
10240 512 7372 8486 18272 18010
10240 1024 5565 9922 18155 18196
10240 2048 9383 9686 18116 18049
10240 4096 9282 8792 18073 18154
10240 8192 3770 10136 18083 18155
Regards,
Jaehoon Chung
Andrei Warkentin wrote:
> On Fri, May 20, 2011 at 1:49 AM, Andrei Warkentin <andreiw@xxxxxxxxxxxx> wrote:
>> On Thu, May 19, 2011 at 11:38 PM, Jaehoon Chung <jh80.chung@xxxxxxxxxxx> wrote:
>>> Hi Andrei,
>>>
>>> Andrei Warkentin wrote:
>>>> On Wed, May 18, 2011 at 9:37 PM, Jaehoon Chung <jh80.chung@xxxxxxxxxxx> wrote:
>>>>> Hi Andrei
>>>>>
>>>>> Andrei Warkentin wrote:
>>>>>> CMD23-prefixed instead of open-ended multiblock transfers
>>>>>> have a performance advantage on some MMC cards.
>>>>>>
>>>>> you mentioned about "some MMC cards".
>>>>> Conversely, that means the some card didn't have a performance advantage?
>>>>>
>>>>> Did you find the performance advantage?
>>>>> if you found the advantage and you can tell me,
>>>>> i want to know what do you have the some MMC cards..
>>>>>
>>>> I've tested this on a Sandisk eMMC where I saw as good as
>>>> a 50% improvement on writes (30% real-life use cases). This was a
>>>> SEM32G 4.3+ part.
>>> Can you tell me your environment? buswidth, AP information, benchmark etc..
>>> And if you have the performance result's data, can you share them?
>>>
>> This was on an SDHCI controller (hence the patch...) on a Tegra
>> 2-based system. I was measuring
>> throughput on reads and writes (obviously without block cache,
>> filesystem, etc) to an eMMC card, 8 bits.
>>
>> Tested both with my tool (https://github.com/andreiw/superalign) and
>> an sqllite-based test.
>>
>> I'm attaching the data I have.
>>
>> A
>>
>
> Additionally, CMD23 use is a requirement for SDXC cards (Arindam can
> comment on that), as well as for MMC reliable writes and eMMC 4.5-spec
> features (Yunpeng Gao can comment on that).
>
> These patches allow CMD23 use. They do involve a some changes to host
> controller because of interaction with CMD12, as well as Auto-CMD12
> and Auto-CMD23 features. I can definitely consult you if you need help
> implementing CMD23 support for whatever controller you develop for.
>
> A
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