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Groups > linux.kernel > #1277356
| From | Fabrice Triboix <fabrice.triboix@v-nova.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Debugging problems with SCHED_FIFO and CPU affinity |
| Date | 2015-11-25 13:50 +0100 |
| Message-ID | <qyHGi-6l3-29@gated-at.bofh.it> (permalink) |
| Organization | linux.* mail to news gateway |
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 Company registration number: 08121803 Place of registration: England This email and any attachments are sent in strictest confidence for the sole use of the addressee and may contain legally privileged, confidential, and proprietary data. If you are not the intended recipient, please advise the sender by replying promptly to this email and then delete and destroy this email and any attachments without any further use, copying or forwarding. Please consider your environmental responsibility before printing this e-mail -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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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
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