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On 02/01/2014 05:39 PM, Stan Hoeppner wrote:

Phillip, you seem to be arguing application performance.  For an 
application/data type that doesn't need fsync you'd be correct.

However, the purpose of this exchange has been to determine the
maximum hardware throughput of the OP's array.  It's not possible
to accurately measure IO throughput doing buffered writes.  Thus
O_DIRECT is needed.

No, you can get there just fine with buffered IO as well, unless you
have an obscenely fast array and very slow ram, the overhead of
buffering won't really matter for IO throughput ( just the extra cpu ).


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