Re: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest]

From: Rik van Riel (
Date: Mon Feb 10 2003 - 16:43:32 EST

On Mon, 10 Feb 2003, Kurt Garloff wrote:

> Readahead kills seeks and command overhead at the expense of maybe
> transfering data needlessly over the bus and consuming RAM.
> AS kills seeks. (At the expense of delaying some IO a tiny bit.)
> If unecessary seeks are the main problem, with AS smaller READA is
> possible. If command overhead is a problem, READA needs to be large.

Think about reading inode blocks or a bunch of related .h
files. We can't nicely do readahead in either of these
scenarios, but AS should take care of them nicely...


Bravely reimplemented by the knights who say "NIH".
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