[PATCH] nvme: Acknowledge completion queue on each iteration

Keith Busch keith.busch at intel.com
Tue Jul 18 14:26:32 PDT 2017

On Tue, Jul 18, 2017 at 02:52:26PM -0400, Sinan Kaya wrote:
> On 7/18/2017 10:36 AM, Keith Busch wrote:
> I do see that the NVMe driver is creating a completion interrupt on
> each CPU core for the completions. No problems with that. 
> However, I don't think you can guarantee that there will always be a single
> CPU core targeting one submission queue especially with asynchronous IO.
> Lock contention counters from CONFIG_LOCK_STAT are pointing to nvmeq->lock
> in my FIO tests.
> Did I miss something?

I think that must mean your machine has many more CPUs than your nvme
controller has IO queues.

More information about the Linux-nvme mailing list