Re: [PATCH] speed up SATA

[Jeff Garzik]

Andrea Arcangeli wrote:
> is beneficial at all, and your bootup log showing 32M is all but
> exciting, I'd be a lot more excited to see 512k there.


Just to clarify...   32MB would never ever be reached.  The S/G table 
limit means requests are limited to 8MB.  VM thresholds and user 
application use further limit request size.

I think Andrew's point is actually more relevant than examining the size 
of a single request:

> 	the effect of really big requests will be the same
> 	as the effect of permitting _more_ requests. 

Thus like the "1,000 disks" example, memory management needs to make 
sure that an "unreasonable" amount of memory is not being pinned.

	Jeff



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