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Reducing jitter on Linux with task isolation

Submitted by Roy Schestowitz on Monday 4th of May 2020 12:20:03 AM Filed under
Linux

Last week I gave a talk at the first virtual adhoc.community meetup on the history of task isolation on Linux (slides, video). It was a quick 15-minute presentation, and I think it went well, but I really wanted to include some details of how you actually configure a modern Linux machine to run a workload without interruption. That’s kinda difficult to do in 15 minutes.

So that’s what this post is about.

I’m not going to cover how to use the latest task isolation mode patches because they’re still under discussion on the linux-kernel mailing list. Instead, I’m just going to talk about how to reduce OS jitter by isolating tasks using Linux v4.17+.

First, as the below chart shows, you really do need a recent Linux kernel if you’re going to run an isolated workload because years of work have gone into making the kernel leave your tasks alone when you ask.

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