Messages in this thread | | | Date | Sun, 10 Nov 2002 20:03:01 -0800 | From | Andrew Morton <> | Subject | Re: [BENCHMARK] 2.4.{18,19{-ck9},20rc1{-aa1}} with contest |
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Andrea Arcangeli wrote: > > the slowdown happens in this case: > > queue 5 6 7 8 9 > > insert read 3 > > queue 3 5 6 7 8 9
read-latency will not do that.
> However I think even read-latency is more a workarond to a problem in > the I/O queue dimensions.
The problem is the 2.4 algorithm. If a read is not mergeable or insertable it is placed at the tail of the queue. Which is the worst possible place it can be put because applications wait on reads, not on writes. - 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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