Re: O_DIRECT performance impact on 2.4.18

From: Bernd Eckenfels (
Date: Sat May 11 2002 - 14:55:06 EST

In article <> you wrote:
> I bet you could get _better_ performance more cleanly by splitting up the
> actual IO generation and the "user-space mapping" thing sanely. For
> example, if you want to do an O_DIRECT read into a buffer, there is no
> reason why it shouldn't be done in two phases:

This works for your load, but it does not work for the load it is designed
for. Sequentially reading and througput is not the way to measure it. You
need random reading and lattency to see it's merrits.

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