Messages in this thread | | | Date | Mon, 25 May 2009 13:48:23 +0200 | From | Pierre Ossman <> | Subject | Re: [PATCH] mmc_spi: use EILSEQ for possible transmission errors |
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On Wed, 20 May 2009 19:02:51 -0700 David Brownell <david-b@pacbell.net> wrote:
> On Wednesday 20 May 2009, Pierre Ossman wrote: > > > Remember that the > > > firmware in the card can leverage "that's erased" knowledge for > > > things like wear leveling. SSDs and other storage devices would > > > likewise benefit from such knowledge. I'm quite certain there's > > > been discussion about adding support for that in the block layer. > > > > It's already in AFAIK. I even had code for hooking it up to mmc_block. > > But it didn't produce any measurable results so I never merged it. > > I'd expect the results would take time to show. As in, they would > facilitate wear leveling logic, which may be difficult to measure > except by testing various cards to destruction ... even for vendors > that *do* have decent wear leveling. :) >
Who are these mythical decent vendors you speak of? ;)
Seriously though, the modifications to mmc_block can still be found here if anyone wants to play with it:
http://git.infradead.org/users/drzeus/discard-2.6.git
I haven't checked if it still applies to the current version of the kernel though, so you're on your own. ;)
Rgds -- -- Pierre Ossman
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