Study of nginx-1.9.12 performance/latency on DragonFlyBSD-g67a73.
sepherosa at gmail.com
Mon May 9 18:38:37 PDT 2016
On Tue, May 10, 2016 at 1:40 AM, Matthew Dillon <dillon at backplane.com> wrote:
> Very interesting results. I'm not surprised that lowering the poll rate
> improves the results, that's an artifact of scheduling larger batches (as
> long as the ring buffer doesn't fill up completely). It's true for process
> scheduling too but usually at the cost of losing interactive responsiveness
> which is why schedulers implement hybrid mechanics.
> I was surprised that the chipset-rate-limited interrupt mode was so bad
> compared to the polling. I would have expected it to approach polling
> effectiveness at the same frequency. But it clearly doesn't (at least not
> at ~7000-8000hz). If you can program it, could you try a lower chipset
> interrupt rate at 1000hz and 4000hz?
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