* Error while enabling io_poll for NVMe SSD
@ 2019-03-18 22:14 Nikhil Sambhus
2019-03-18 22:21 ` Keith Busch
0 siblings, 1 reply; 3+ messages in thread
From: Nikhil Sambhus @ 2019-03-18 22:14 UTC (permalink / raw)
To: linux-block
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.
--
Regards,
Nikhil P Sambhus
"To bug is human, to debug is divine"
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Error while enabling io_poll for NVMe SSD
2019-03-18 22:14 Error while enabling io_poll for NVMe SSD Nikhil Sambhus
@ 2019-03-18 22:21 ` Keith Busch
2019-03-19 14:36 ` Nikhil Sambhus
0 siblings, 1 reply; 3+ messages in thread
From: Keith Busch @ 2019-03-18 22:21 UTC (permalink / raw)
To: Nikhil Sambhus; +Cc: linux-block
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.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Error while enabling io_poll for NVMe SSD
2019-03-18 22:21 ` Keith Busch
@ 2019-03-19 14:36 ` Nikhil Sambhus
0 siblings, 0 replies; 3+ messages in thread
From: Nikhil Sambhus @ 2019-03-19 14:36 UTC (permalink / raw)
To: Keith Busch; +Cc: linux-block
Thanks, it worked!
On Mon, Mar 18, 2019 at 6:20 PM Keith Busch <kbusch@kernel.org> wrote:
>
> 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.
--
Regards,
Nikhil P Sambhus
"To bug is human, to debug is divine"
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-03-19 14:37 UTC | newest]
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2019-03-18 22:14 Error while enabling io_poll for NVMe SSD Nikhil Sambhus
2019-03-18 22:21 ` Keith Busch
2019-03-19 14:36 ` Nikhil Sambhus
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