Description of problem:
One patch is for avoiding to dequeue two many requests, so io merge can be
Another patch is for fixing batching dispatch, in which hctx->dispatch_busy
is evaluated, but not get updated.
sanity test passed with kernel-4.18.0-327.el8:
All fix patches has included to kernel tree:
$ git log kernel-4.18.0-327.el8 --oneline --grep=1976679
14b1478fd252 Merge: block: improve batching dispatch and fix discard request merge
377ced4accb4 blk-mq: update hctx->dispatch_busy in case of real scheduler
40aa7107656c block: Do not pull requests from the scheduler when we cannot dispatch them
move to verified + sanityonly
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (Moderate: kernel security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.