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authorAlan D. Brunelle <Alan.Brunelle@hp.com>2010-01-29 09:04:08 +0100
committerJens Axboe <jens.axboe@oracle.com>2010-01-29 09:04:08 +0100
commit488991e28e55b4fbca8067edf0259f69d1a6f92c (patch)
treefea5e0aca42e338137cc050e66aaeb5f539e3d21 /drivers/block
parent47483e25205f1f8d79784f0f7c733941bc080ec0 (diff)
block: Added in stricter no merge semantics for block I/O
Updated 'nomerges' tunable to accept a value of '2' - indicating that _no_ merges at all are to be attempted (not even the simple one-hit cache). The following table illustrates the additional benefit - 5 minute runs of a random I/O load were applied to a dozen devices on a 16-way x86_64 system. nomerges Throughput %System Improvement (tput / %sys) -------- ------------ ----------- ------------------------- 0 12.45 MB/sec 0.669365609 1 12.50 MB/sec 0.641519199 0.40% / 2.71% 2 12.52 MB/sec 0.639849750 0.56% / 2.96% Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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