[PATCH V2 0/2] mmc: hsq: Dynamically adjust hsq_depth to improve performance

[Wenchao Chen]

Change in v2:
- Support for dynamic adjustment of hsq_depth.

Test
=====
I tested 3 times for each case and output a average speed.
Ran 'fio' to evaluate the performance:
1.Fixed hsq_depth
1) Sequential write:
Speed: 168 164 165
Average speed: 165.67MB/S

2) Sequential read:
Speed: 326 326 326
Average speed: 326MB/S

3) Random write:
Speed: 82.6 83 83
Average speed: 82.87MB/S

4) Random read:
Speed: 48.2 48.3 47.6
Average speed: 48.03MB/S

2.Dynamic hsq_depth
1) Sequential write:
Speed: 167 166 166
Average speed: 166.33MB/S

2) Sequential read:
Speed: 327 326 326
Average speed: 326.3MB/S

3) Random write:
Speed: 86.1 86.2 87.7
Average speed: 86.67MB/S

4) Random read:
Speed: 48.1 48 48
Average speed: 48.03MB/S

Based on the above data, dynamic hsq_depth can improve the performance of random writes.
Random write improved by 4.6%.

Test cmd
=========
1)write: fio -filename=/dev/mmcblk0p72 -direct=1 -rw=write -bs=512K -size=512M -group_reporting -name=test -numjobs=8 -thread -iodepth=64									
2)read: fio -filename=/dev/mmcblk0p72 -direct=1 -rw=read -bs=512K -size=512M -group_reporting -name=test -numjobs=8 -thread -iodepth=64									
3)randwrite: fio -filename=/dev/mmcblk0p72 -direct=1 -rw=randwrite -bs=4K -size=512M -group_reporting -name=test -numjobs=8 -thread -iodepth=64									
4)randread: fio -filename=/dev/mmcblk0p72 -direct=1 -rw=randread -bs=4K -size=512M -group_reporting -name=test -numjobs=8 -thread -iodepth=64									


Wenchao Chen (2):
  mmc: queue: replace immediate with hsq->depth
  mmc: hsq: dynamic adjustment of hsq->depth

 drivers/mmc/core/queue.c   |  6 +-----
 drivers/mmc/host/mmc_hsq.c | 27 +++++++++++++++++++++++++++
 drivers/mmc/host/mmc_hsq.h |  8 ++++++++
 include/linux/mmc/host.h   |  1 +
 4 files changed, 37 insertions(+), 5 deletions(-)

-- 
2.17.1