UBI memory usage on large page nand

[Nicholas]

Dear Artem,

If I reduce ubi->peb_buf1 and ubi->peb_buf2 with allocation of smaller
memory spaces, will they affect to IO ( read / write ) ?
Will it cause block data wasted ? Since buffer is allocated less than
block size .

Regards,
Alex

On Sun, Apr 17, 2011 at 5:16 PM, Artem Bityutskiy <dedekind1 at gmail.com> wrote:
> On Sun, 2011-04-17 at 17:03 +0800, Nicholas wrote:
>> Dear Artem,
>>
>> Thanks for the advices. I'll try start for UBI first.
>>
>> Reducing peb_buf would mean i need to modify the ubi IO for read/write.
>> As i know, ubi did an erase for a whole block before start writing,
>>
>> Please correct me if i've written in a wrong way.
>
> Yes, when you investigate the code, you'll even find that if extra self
> checks are enabled, UBI will verify that the area it writes to contains
> only 0xFFs - it will read the area, compare with 0xFFs, and if all bytes
> are 0xFFs it will proceed, otherwise it will shout loudly. See:
>
> ubi_io_write() - all writes go through this function, and
> ubi_dbg_check_all_ff - does the verification I talked about, but only in
> debugging mode, because it is too costly to do it in production mode.
>
> --
> Best Regards,
> Artem Bityutskiy (Битюцкий Артём)
>
>