Re: [PATCH] block/027: setup scsi_debug with MQ

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On Oct 22, 2024 / 14:41, Ming Lei wrote:
> 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>

I applied it along with a shellcheck warning fix. Thanks!




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