Re: [PATCH] speed up SATA

From: Jeff Garzik
Date: Sun Mar 28 2004 - 15:53:37 EST

Andrew Morton wrote:
Jeff Garzik <jgarzik@xxxxxxxxx> wrote:

I like generic tunables such as "laptop mode" or "low latency" or "high throughput". These sorts of tunables should affect the "automagic" calculations.

Not sure. Things like "low latency" and "high throughput" may need other
things, such as "seek latency" and "bandwidth" as _inputs_, not as outputs.

I should probably better define the hypotheticals :) I think of "laptop mode" or "low latency versus high throughput" more as high level binary flags, influencing widely varying things like from an ATA disk's "low noise versus high performance" tunable to the IO scheduler's deadlines.

Such device parameters should have reasonable defaults, and use a userspace
app which runs a quick seek latency and bandwidth test at mount-time,
poking the results into sysfs.



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