Real-Time Tuning

I tried a number of things that are supposed to improve real-time performance, as described in this forum post.

But not much changed. This series of jitter-histograms shows little or no changes:

0 1 2 3 4

The things I tried are roughly

  1. measure first latency histogram 0.png
  2. uninstall the package irqbalance using synaptic. reboot.
  3. measure 1.png
  4. in /etc/default/grub modify GRUB_CMDLINE_LINUX_DEFAULT="isolcpus=1 acpi_irq_nobalance noirqbalance"  (Aside: why are the files in /etc/grub.d/ made so incredibly hard to read? Someone should re-write them in Python!). Run sudo update-grub. reboot.
  5. measure 2.png
  6. Add irq-affinity.conf to /etc/init/
  7. Add set-irq-affinity and watchirqs to /usr/local/sbin. reboot
  8. measure 3.png
  9. Try to tweak BIOS settings. Turn off power-saving features, etc.
  10. measure 4.png

The output of watchirqs looks like this:

watchirqs_before_boot watchirqs_last

The scripts mentioned above: irqstuff

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