Re: slow eMMC write speed

Praveen G K
2011-09-28T19:06:04Z

On Tue, Sep 27, 2011 at 10:42 PM, Linus Walleij
<linus.walleij@linaro.org> wrote:
> On Fri, Sep 23, 2011 at 7:05 AM, Praveen G K <praveen.gk@gmail.com> wrote:
>
>> I am working on the block driver module of the eMMC driver (SDIO 3.0
>> controller).  I am seeing very low write speed for eMMC transfers.  On
>> further debugging, I observed that every 63rd and 64th transfer takes
>> a long time.
>
> Are you not just seeing the card-internal garbage collection?
> http://lwn.net/Articles/428584/
Does this mean, theoretically, I should be able to achieve larger
speeds if I am not using linux? So, is this a software issue? or if
there is a way to increase the size of bounce buffers to 4MB?

> Yours,
> Linus Walleij
>