This patchset removes se_session sess_cmd_lock for every driver but
tcm qla2xxx and moves the se_device execution lock to per CPU so
we can run submissions from multiple CPUs without hammering on
those locks.
With the patches I'm seeing a 25% improvement in IOPs for small
IO tests like:
fio --filename=/dev/sdXYZ --direct=1 --rw=randrw --bs=4k \
--iodepth=128 --numjobs=16
I'm sending this as RFC, because the qla2xxx patches are not
tested and I'm hoping we can maybe just remove the session
locking/list from that driver since it's only used to lookup
commands for aborts when a specific model is used.
The following patches are made over Linus's tree. Some of Martin's
branches are missing:
commit 149415586243bd0ea729760fb6dd7b3c50601871
Author: Sudhakar Panneerselvam <sudhakar.panneerselvam@xxxxxxxxxx>
Date: Wed Sep 16 23:54:31 2020 +0000
scsi: target: Fix lun lookup for TARGET_SCF_LOOKUP_LUN_FROM_TAG case
