RE: [PATCH V2 4/8] block: null_blk: introduce module parameter of 'g_global_tags'

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> This patch introduces the parameter of 'g_global_tags' so that we can
> test this feature by null_blk easiy.
> 
> Not see obvious performance drop with global_tags when the whole hw
> depth is kept as same:
> 
> 1) no 'global_tags', each hw queue depth is 1, and 4 hw queues
> modprobe null_blk queue_mode=2 nr_devices=4 shared_tags=1 global_tags=0
> submit_queues=4 hw_queue_depth=1
> 
> 2) 'global_tags', global hw queue depth is 4, and 4 hw queues
> modprobe null_blk queue_mode=2 nr_devices=4 shared_tags=1 global_tags=1
> submit_queues=4 hw_queue_depth=4
> 
> 3) fio test done in above two settings:
>    fio --bs=4k --size=512G  --rw=randread --norandommap --direct=1 --
> ioengine=libaio --iodepth=4 --runtime=$RUNTIME --group_reporting=1  --
> name=nullb0 --filename=/dev/nullb0 --name=nullb1 --filename=/dev/nullb1 --
> name=nullb2 --filename=/dev/nullb2 --name=nullb3 --filename=/dev/nullb3
> 
> 1M IOPS can be reached in both above tests which is done in one VM.
> 
I am getting 1.1M IOPS for both cases.

Tested-by: Don Brace <don.brace@xxxxxxxxxxxxx>






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