Scalability issue with multiple NVMe Devices with one core

[Keith Busch]

On Thu, Oct 13, 2016 at 08:44:37AM +0300, Roy Shterman wrote:
> scenario is when running traffic over 1 NVMe Device with 1 core I'm getting
> X IOPS and Y% core utilization.
> 
> In my perception, when adding more NVMe Devices I should see some linearity
> of the above results, but I'm getting only a small improvement in IOPS and
> still not getting 100% (or closer ) in CPU utilization.
> 
> Any suggestions?

How are you generating IO?