On Wed, Jan 18, 2017 at 5:27 PM, Sagi Grimberg [off-list ref] wrote:

quoted

So what you say is you saw a consomed == 1 [1] most of the time?

[1] from
http://git.infradead.org/nvme.git/commitdiff/eed5a9d925c59e43980047059fde29e3aa0b7836

Exactly. By processing 1 completion per interrupt it makes perfect sense
why this performs poorly, it's not worth paying the soft-irq schedule
for only a single completion.

Your report provided this stats with one-completion dominance for the
single-threaded case. Does it also hold if you run multiple fio
threads per core?

Regards,
Andrey

What I'm curious is how consistent is this with different devices (wish
I had some...)


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