9-11 September 2019
Europe/Lisbon timezone

Mathematizing the latency

11 Sep 2019, 11:01
30m
Esmerelda/room-I&II (Corinthia Hotel Lisbon)

Esmerelda/room-I&II

Corinthia Hotel Lisbon

126

Speaker

Daniel Bristot de Oliveira (Red Hat, Inc.)

Description

We know that reducing the sections with preemption and IRQ disabled reduces the latency, also that IRQs influences on it, but some cases are hard to catch. For example, in the old jump label update, there was a burst of IPIs causing latency spikes. Such non-periodic behavior is hard to mathematize. As a side effect, this adds pessimism to "possible formulas" that tries to define the worst-case latency, mainly regarding IRQs. Daniel would like to discuss his idea about the possible approaches to this problem, without adding unpractical pessimism.

I agree to abide by the anti-harassment policy Yes

Primary author

Presentation Materials