Scalability issue with multiple NVMe Devices with one core

Roy Shterman roysh at
Thu Oct 13 07:13:07 PDT 2016

On 10/13/2016 5:18 PM, Keith Busch wrote:
> 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?
Sorry, last response I sent was with IODEPTH=1, I'm changing the IODEPTH 
to 8-32.

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