block/027 focuses on race condition between blkg association and
request_queue shutdown. Unfortunately it is a bit easy to trigger
lockup by setting scsi_debug in the following way:
- single queue
- 21 LUNs
- small queue depth(110)
- 10us completion delay
- fio: 4 jobs, with iodepth 2048
The above setting creates big contention on tag allocation of blk-mq
code path, especially scsi_debug takes memcpy to simulate IO, which
doesn't match device in reality.
So setup scsi_debug with MQ and avoid to trigger lockup which doesn't
exist in real storage device usually.
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
tests/block/027 | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tests/block/027 b/tests/block/027
index a79a115..cf4ff16 100755
--- a/tests/block/027
+++ b/tests/block/027
@@ -84,7 +84,7 @@ test() {
echo "Running ${TEST_NAME}"
scsi_debug_stress_remove virtual_gb=128 max_luns=21 ndelay=10000 \
- max_queue=110
+ max_queue=110 submit_queues=$(nproc)
echo "Test complete"
}
--
2.46.0
