Re: [PATCH] speed up SATA

Jeff Garzik
2004-03-29T04:58:15Z

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