Re: [PATCH 2/9] block: null_blk: introduce module parameter of 'g_host_tags'

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On 5/31/19 4:27 AM, Ming Lei wrote:
> Introduces parameter of 'g_host_tags' for testing hostwide tags.
> 
> Not observe performance drop in the following test:
> 
> 1) no 'host_tags', hw queue depth is 16, and 1 hw queue
> modprobe null_blk queue_mode=2 nr_devices=4 shared_tags=1 host_tags=0 submit_queues=1 hw_queue_depth=16
> 
> 2) 'host_tags', global hw queue depth is 16, and 8 hw queues
> modprobe null_blk queue_mode=2 nr_devices=4 shared_tags=1 host_tags=1 submit_queues=8 hw_queue_depth=16
> 
> 3) fio test command:
> 
> fio --bs=4k --ioengine=libaio --iodepth=16 --filename=/dev/nullb0:/dev/nullb1:/dev/nullb2:/dev/nullb3 --direct=1 --runtime=30 --numjobs=16 --rw=randread --name=test --group_reporting --gtod_reduce=1
> 
> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
> ---
>  drivers/block/null_blk_main.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@xxxxxxx			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG Nürnberg)



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