Oleg Nesterov wrote:
>
> Afaics, this problem was resolved a long ago.
>
> The patch below should fix this problem. Does it?
Forgot to mention, this patch was tested,
Steven Pratt wrote:
>
> This is the patch I think we should apply. Running tiobench with 4k
> request size, 4GB working set, 256 threads and a 2MB max_readahead (to
> help induce thrashing) on a 1GB 8way machine, throughput of sequential
> IO increased from 50MB/sec to 92MB/sec on a 5disk raid0 array. Tests
> with smaller max_readaheads and smaller thread counts were all withing
> the noise range of the benchmark, which is to be expected.
Oleg.
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