Acceleration for map_copy_from on powerpc 512x
Fortini Matteo
matteo.fortini at mta.it
Tue Oct 27 21:02:07 EST 2009
The simple_map_init() works at a higher level, what I'm redefining is a
function called by mtd->read()
The block size for e.g. a dd if=/dev/mtd0 of=/dev/null
with the default block size (I believe it's 512Bytes), fetches from
/dev/mtd0 4096 Bytes at a time.
I'd prefer the kernel to be scheduling other tasks meanwhile, instead of
busy-waiting on completion.
Regards
Kenneth Johansson ha scritto:
> On Mon, 2009-10-19 at 09:52 +0200, Fortini Matteo wrote:
>
>
>> I didn't find a cleaner way than just #ifdef'ing the map_copy_from call
>> and substitute with my call on relevant cases. I wonder if there is a
>> cleaner way.
>>
>
> Remove the call to simple_map_init() and do it manually in your driver
> with your own functions.
>
>
>> And yes, as soon as I've cleaned up the code a little bit, I will
>> definitely post a patch about it.
>>
>> Moreover: a huge benefit would come from exploiting DMA on these
>> transfers,
>>
>
> probably depends on the block size if it's a gain or not. What is the
> size you normally see.
>
>
>
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