On Tue, 16 Mar 1999 00:40:57 +0100 (CET), Rik van Riel
<riel@nl.linux.org> said:
> With the (very) agressive readahead we're doing
> now, a request queue of 64 entries really won't
> be big enough any more. In fact, it'll only be
> big enough for 2 to 4 'actual' requests.
No, we automatically merge sequential IOs into a single request so the
readahead will typically only occupy a fairly small fraction of the
request queue. Only if you encounter really excessive filesystem
fragmentation will you start to hammer the request queue.
--Stephen
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