On Mon, Mar 18, 2019 at 06:14:01PM -0400, Nikhil Sambhus wrote: > Hi, > > On a Linux Kernel 5.0.0+ machine (Ubuntu 16.04) I am using the > following command as a root user to enable polling for a NVMe SSD > device. > > # echo 1 > /sys/block/nvme2n1/queue/io_poll > > I get the following error: > > bash: echo: write error: Invalid argument > > The current value of io_poll is 0. Be sure to turn on the polling queues in the nvme driver. There are none by default. The kernel parameter to that enable them is: nvme.poll_queues=X Where 'X' is the number of polling queues. I'd recommend at least 1 per CPU socket, but more is better.
