Messages in this thread |  | | Date | Wed, 13 Oct 2004 14:48:06 +0200 | From | Pierre Ossman <> | Subject | Re: Choosing scatter/gather limits |
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Russell King wrote:
>On Mon, Oct 11, 2004 at 12:53:23PM +0200, Pierre Ossman wrote: > > >>I've been adding scatter/gather support for the MMC host driver I'm >>writing. I cannot find any documentation on how to chose the limits though. >> >> > >It seems that you have to read the block layer code to find out what's >going on with these limits. There's some documentation on it in >Documentation/block/bio.txt. If it's lacking, then please send >comments to the block layer people to add the necessary information. > > > I just wanted to make sure I don't pick values that causes problems somewhere else. I'll make an attempt to dig through the bio code though.
>Please also note that I'm intending to make the MMC host drivers >know nothing about block IO stuff, so all you'll be passed is the >MMC commands and a scatter gather list - so making sure that your >driver always uses blk_rq_map_sg() and works from the SG list will >ensure that your driver remains easy to update. > > > Shouldn't be a problem. The SGIO support in the driver is done. Just need to get rid of all bugs.
Rgds Pierre
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