There are some devices for which nvme driver takes a long time to
finalize the unbind stage. With that in mind, each device would
add up a significant amount of time needed for setup.sh to complete.
To mitigate such a scenario, make sure the controllers are unbound
in a parallel fashion.
Examples taken from the system with 19 nvmes on board:
[root@supermicro4 spdk]# time ./scripts/setup.sh &>/dev/null
real 0m36.250s
user 0m1.024s
sys 0m1.990s
[root@supermicro4 spdk]# time ./scripts/setup.sh &>/dev/null
real 0m4.848s
user 0m0.867s
sys 0m17.605s
Also, take note that this is currently done only for the nvme
devices since other, i.e., ioatdma, seem to trigger a BUG in the
kernel when unbound in parallel. Some details here:
https://bugzilla.kernel.org/show_bug.cgi?id=209041
Change-Id: Icaeb2b2ecb306f149587bc5da73743b1519bc5d6
Signed-off-by: Michal Berger <michalx.berger@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/3893
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
904ac49f4c