nvmet-rdma: use sbitmap to replace rsp free list

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We can use sbitmap to manage all the nvmet_rdma_rsp instead of using
free lists and spinlock, and we can use an additional tag to
determine whether the nvmet_rdma_rsp is extra allocated.

In addition, performance has improved:
1. testing environment is local rxe rdma devie and mem-based
backstore device.
2. fio command, test the average 5 times:
fio -filename=/dev/nvme0n1 --ioengine=libaio -direct=1
-size=1G -name=1 -thread -runtime=60 -time_based -rw=read -numjobs=16
-iodepth=128 -bs=4k -group_reporting
3. Before: 241k IOPS, After: 256k IOPS, an increase of about 5%.

Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>

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Guixin Liu 2024-10-08 17:37:08 +08:00 • committed by Keith Busch

parent 782373ba27

commit 40f0e5dc2f

1 changed files with 27 additions and 29 deletions

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drivers/nvme/target/rdma.c

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