Ah, yes, shell history ftw. Of course you should ensure no filesystem is mounted or such:

    root@awork3:~# echo 4 > /sys/module/nvme/parameters/poll_queues
    root@awork3:~# echo 1 > /sys/block/nvme1n1/device/reset_controller
    root@awork3:~# dmesg -c
    [749717.253101] nvme nvme1: 12/0/4 default/read/poll queues
    root@awork3:~# echo 8 > /sys/module/nvme/parameters/poll_queues
    root@awork3:~# dmesg -c
    root@awork3:~# echo 1 > /sys/block/nvme1n1/device/reset_controller
    root@awork3:~# dmesg -c
    [749736.513102] nvme nvme1: 8/0/8 default/read/poll queues