On 17.02.21 21:28, Mike Christie wrote:

This patch adds plug/unplug callouts for tcmu, so we can avoid the
number of times we switch to userspace. Using this driver with tcm
loop is a common config, and dependng on the nr_hw_queues
(nr_hw_queues=1 performs much better) and fio jobs (lower num jobs
around 4) this patch can increase IOPs by only around 5-10% because
we hit other issues like the big per tcmu device mutex.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
  drivers/target/target_core_user.c | 27 +++++++++++++++++++++++++--
  1 file changed, 25 insertions(+), 2 deletions(-)

Looks good.

Reviewed-by: Bodo Stroesser <bostroesser@gmail.com>