[PATCH v2] nvmet-rdma: use sbitmap to replace rsp free list

[Keith Busch]

On Tue, Oct 08, 2024 at 05:37:08PM +0800, Guixin Liu wrote:
> 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%.

Applied, thanks.