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| author | Shaohua Li <shli@kernel.org> | 2014-04-09 11:25:47 +0800 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2014-04-09 14:42:38 +1000 |
| commit | 27c0f68f0745218cec70f19ba7560c8c5fc3f817 (patch) | |
| tree | c8f8fcefca0ced4a5e990a94094c2c2b70ee2c55 /block | |
| parent | e2f23b606b94f28a8febd5aa715df697d80b018e (diff) | |
| download | op-kernel-dev-27c0f68f0745218cec70f19ba7560c8c5fc3f817.zip op-kernel-dev-27c0f68f0745218cec70f19ba7560c8c5fc3f817.tar.gz | |
raid5: make_request does less prepare wait
In NUMA machine, prepare_to_wait/finish_wait in make_request exposes a
lot of contention for sequential workload (or big request size
workload). For such workload, each bio includes several stripes. So we
can just do prepare_to_wait/finish_wait once for the whold bio instead
of every stripe. This reduces the lock contention completely for such
workload. Random workload might have the similar lock contention too,
but I didn't see it yet, maybe because my stroage is still not fast
enough.
Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions
