On Mon, 17 May 1999 10:54:04 +0200 (MEST), R.E.Wolff@BitWizard.nl
(Rogier Wolff) said:
> Indirect and double indirect (*) blocks might need reading. To do 15Mb
> per second, we need to read 15k worth of indirect block pointers. That
> is 60k per second. We should be able to do better than that....
No, not really. That 60k is 60 separate 1k IOs with a seek/disk
rotation latency between each one. With any significant CPU work being
done between those IOs, 60 in a second is perfectly reasonable. High
disk bandwidth only works when you are streaming sequentially off the
disk: if you are doing lots of separate 1k IOs, IOs/second is a much
more meaningful figure than kB/second.
--Stephen
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