diff options
| author | Laibin Qiu <[email protected]> | 2022-01-27 18:00:47 +0800 |
|---|---|---|
| committer | Jens Axboe <[email protected]> | 2022-01-27 10:15:32 -0700 |
| commit | 10825410b956dc1ed8c5fbc8bbedaffdadde7f20 (patch) | |
| tree | 815182f8e069faa0ade6c37dd86beca376d825c6 /include/linux/fpga/fpga-mgr.h | |
| parent | 3c8cef9f3d86d9bf3402f5b397f92fc7026f78b6 (diff) | |
blk-mq: Fix wrong wakeup batch configuration which will cause hang
Commit 180dccb0dba4f ("blk-mq: fix tag_get wait task can't be
awakened") will recalculate wake_batch when incrementing or decrementing
active_queues to avoid wake_batch > hctx_max_depth. At the same time, in
order to not affect performance as much as possible, the minimum wakeup
batch is set to 4. But when the QD is small (such as QD=1), if inc or dec
active_queues increases wakeup batch, that can lead to a hang:
Fix this problem with the following strategies:
QD : >= 32 | < 32
---------------------------------
wakeup batch: 8~4 | 3~1
Fixes: 180dccb0dba4f ("blk-mq: fix tag_get wait task can't be awakened")
Link: https://lore.kernel.org/linux-block/[email protected]/T/#t
Reported-by: Alex Xu (Hello71) <[email protected]>
Signed-off-by: Laibin Qiu <[email protected]>
Tested-by: Alex Xu (Hello71) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>
Diffstat (limited to 'include/linux/fpga/fpga-mgr.h')
0 files changed, 0 insertions, 0 deletions