Re: NAND pages cache?

[Artem Bityuckiy <dedekind@oktetlabs.ru>]

Thomas Gleixner wrote:
> On Mon, 2004-11-15 at 08:49 +0000, David Woodhouse wrote:
> 
>>On Mon, 2004-11-15 at 11:49 +0300, Artem Bityuckiy wrote:
>>
>>>So, the obvious idea how to avoid this is to introduce something like 
>>>NAND pages cache. The cache will keep several NAND pages which were last 
>>>accessed.
>>>
>>>I don not know is it good to do this only in JFFS2 or on the MTD NAND layer?
>>
>>I thought we already did this in the MTD NAND layer, since we had to
>>read whole pages there to do ECC anyway. Thomas?
> 
> 
> We do caching only if a page is read partially. If we read a full page
> we read directly into the fs buffer.
> 
> The partial reads happen when we read nodes. The full page reads happen
> when we read data. That's sufficient and captures most of the double
> reads on the same page.
> 
> tglx
Hmm, It seems I do not know something about MTD. I thought it *always* 
reads whole
pages in orger to always check ECC... I'll see this more close.

Ok, thanks for comment.

-- 
Best regards, Artem B. Bityuckiy
Oktet Labs (St. Petersburg), Software Engineer.
+78124286709 (office) +79112449030 (mobile)
E-mail: dedekind@oktetlabs.ru, web: http://www.oktetlabs.ru