Re: [PATCH] speed up SATA

From: Jeff Garzik
Date: Sun Mar 28 2004 - 14:01:35 EST

Bartlomiej Zolnierkiewicz wrote:
On Sunday 28 of March 2004 20:30, Jens Axboe wrote:
Making something user tunable is usually not the best idea, if you can
deduct these things automagically instead. So whether this is the best
idea, depends on which way you want to go.

I think it's the best idea for now, long-term we are better with automagic.

Mostly agreed:

Like I mentioned in the last message, the IO scheduler and the VM should really just figure out request size and queue depth and such based on observation of device throughput and latency. So I agree w/ automagic.

But the sysadmin should also be allowed to say "I don't care about latency" if he has gobs and gobs of memory and knows his configuration well.

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


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