Andrea Arcangeli wrote:
>
> > Whether the IO is synchronous or asynchronous shouldn't matter much,
>
> the fact the I/O is sync or async makes the whole difference. with sync
> reads the vmstat line in the read column will be always very small
> compared to the write column under a write flood. This can be fixed either:
>
> 1) with hacks in the elevator ala read-latency that are not generic and
> could decrease performance of other workloads
read-latency will only do the front-insertion if it was unable to find a
merge or insert on the tail-to-head search.
And the problem it desparately addresses is severe.
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This archive was generated by hypermail 2b29 : Fri Nov 15 2002 - 22:00:20 EST