Messages in this thread | | | Date | Mon, 10 Feb 2003 19:43:32 -0200 (BRST) | From | Rik van Riel <> | Subject | Re: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest] |
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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...
Rik -- Bravely reimplemented by the knights who say "NIH". http://www.surriel.com/ http://guru.conectiva.com/ Current spamtrap: <a href=mailto:"october@surriel.com">october@surriel.com</a> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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