diff options
| author | Ming Lei <[email protected]> | 2017-07-05 12:14:27 +0800 |
|---|---|---|
| committer | Jens Axboe <[email protected]> | 2017-07-05 12:11:26 -0600 |
| commit | 8a05aa4ce3bf767b7bd72851da89c23d084d1ecb (patch) | |
| tree | 2ad465f735488c668d1193d02c066ba3f3b00863 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | ea4d12dabf872b496218cdc8e7874feef8676cdd (diff) | |
mtip32xx: avoid to read HOST_CAP from HW in .queue_rq()
It is observed reading the register from HW takes a bit long,
for example in my box, the following difference of 'perf report
--no-children fio ...' can be seen when running I/O:
1) V4.12 without patch
+ 9.28% fio [mtip32xx] [k] mtip_irq_handler
+ 8.48% fio [mtip32xx] [k] mtip_init_cmd_header
2) V4.12 with the following patch
+ 9.14% fio [mtip32xx] [k] mtip_irq_handler
......
+ 1.14% fio [mtip32xx] [k] mtip_init_cmd_header
IOPS can be increased by ~5% with this patch too.
Fixes: a4e84aae8139(mtip32xx: use runtime tag to initialize command header)
Signed-off-by: Ming Lei <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions