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    SubjectRe: trying to understand READ_META, READ_SYNC, WRITE_SYNC & co
    On Sat, Jun 26, 2010 at 07:25:56PM +1000, Nick Piggin wrote:
    > Biggest thing is multiple small files operations like on the same
    > directory. Best case I measured back when doing AS io scheduler
    > versus deadline was about 100x improvement on a uncached kernel
    > grep workload when competing with a streaming writeout (the writeout
    > probably ended up going somewhat slower naturally, but it is fairer).

    As I mentioned below I absolutely see the case for reads. A normal
    grep basically is a dependent read kind of workload. For for writes
    it should either be O_SYNC-style workloads or batched I/O.


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