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Re: [dm-devel] [PATCH] Make sure QUEUE_FLAG_CLUSTER is set properly for dm.



On Wednesday December 7, agk redhat com wrote:
> On Wed, Dec 07, 2005 at 02:21:58PM +1100, Neil Brown wrote:
> >  the block layer has a flag - QUEUE_FLAG_CLUSTER - which can be set
> 
> Yes, but does it make much difference at the moment, given that we 
> need to use small bios to avoid having to split them if they cross 
> mapping boundaries?  (That's the real problem that needs tackling.)
> 

I'm sorry, I didn't see this back in December... I'm still not used to
these lists that set the 'reply-to' header, so I don't get a reply
explicitly addressed to me.... I've have to make my filters smarter!

Does DM *always* use small bios?  Even for multipath targets, where
presumably there would be no need even to limit the size?

If so, I guess this patch isn't going to make a big difference no, but
it would be worth having it in place for whenever handling larger bios
gets implemented.

Thanks,
NeilBrown


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