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Debugging problems with SCHED_FIFO and CPU affinity

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  Debugging problems with SCHED_FIFO and CPU affinity Fabrice Triboix <fabrice.triboix@v-nova.com> - 2015-11-25 13:50 +0100

#1277356 — Debugging problems with SCHED_FIFO and CPU affinity

Dear All,

We are seeing problem with our application, which is based on Linux.
Our application has many threads and we use SCHED_FIFO for threads that must have a low latency. We also use CPU affinity to try to force an even distribution of the load.

When a given event occurs, one of the SCHED_FIFO thread stops for 83ms and this prevents the correct functionning of the application. Fortunately, this bug is 95% reproducible. Interestingly enough, the problem disappears when I do not set any thread priority and CPU affinity (but the application breaks on the long run).

I am trying to investigate the issue with ftrace, with limited success so far, and I would appreciate a bit of help. I am trying to analyse the ftrace stuff using kernelshark, and I suspect a weird interaction between the the kernel and user-land.

My first question is: Is this the right mailing list to get some help on such an issue?

Many thanks for any help!

  Fabrice Triboix





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