Any ideal way to run FIO benchmarking for NVMEe devices in FreeBSD

Enji Cooper yaneurabeya at gmail.com
Fri Feb 22 09:06:27 UTC 2019


> On Feb 22, 2019, at 12:51 AM, Rajesh Kumar <rajfbsd at gmail.com> wrote:
> 
> Hi,
> 
> I am trying to run FIO benchmark test with NVMe devices and see how FreeBSD
> performs. There are lot of variables and combination. So, can anyone
> suggest a Ideal way to do FIO benchmarking in FreeBSD? My intent is to
> check what is the maximum throughput and IOPS the device delivers in
> FreeBSD.
> 
> Few questions regarding the same,
> 
>   1. Should we use "posixaio" as the ioengine (or) something else?
>   2. Should we use single thread (or) multiple threads for test? If
>   multiple threads, how can we decide on the optimal thread count?
>   3. Should we use "raw device files" (Eg: nvme namespace file -
>   /dev/nvme0ns1) without filesystem (or) use a mounted filesystem with a
>   regular file (Eg: /mnt/nvme/test1). Looks like raw device files give better
>   numbers.
>   4. Should we use a shared file (or) one file per thread?
>   5. I believe 1Job should be fine for benchmarking. (or) should we try
>   multiple jobs?
> 
> Please let me know your suggestions. Also, please suggest performance
> tuning methods for NVMe and storage devices in general.

Hi Rajesh,
	Is there a data sheet for the NVMe device?
Cheers,
-Enji


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