Re: [PATCH] speed up SATA

From: Jamie Lokier
Date: Mon Mar 29 2004 - 08:32:32 EST

Eric D. Mudama wrote:
> On Mon, Mar 29 at 11:30, Nick Piggin wrote:
> >Well strictly, you send them one after the other. So unless you
> >have something similar to our anticipatory scheduler or plugging
> >mechanism, the drive should attack the first one first, shouldn't
> >it?
> If you send 32 commands to our disk at once (TCQ/NCQ) we send 'em all
> to our back-end disk engine as fast as possible.

Are they sent _at once_, or are they sent in sequence? If they're
sent in sequence, even if it's a very rapid sequence, than Nick's
point still stands. If you're not attacking the first request which
arrives, the instant the drive code sees it, you're doing something
similar to the anticipatory scheduler.

-- Jamie
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