Re: [PATCH] speed up SATA

From: Jeff Garzik
Date: Sun Mar 28 2004 - 23:59:11 EST

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.


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