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38 lines
1.4 KiB
Text
38 lines
1.4 KiB
Text
rtirq (set priorities on kernel IRQ threads)
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The rtirq script is a bash script written by Rui Nuno Capela which works
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in conjunction with the IRQ threading facility of the Linux kernel. The
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script takes advantage of the fact that the kernel can use threads for
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IRQs management, and as such these threads (like any other thread running
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on your system) can be given maximum priority in an effort to minimize
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the latency of audio peripherals.
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Modern kernels (3.0 and newer) incorporate IRQ threads, so there's no
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need for a patched kernel on Slackware 14.0 or newer. Older systems
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would need the realtime kernel patch.
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The script is installed as /etc/rc.d/rc.rtirq. To actually run it at
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boot time, add code like this to /etc/rc.d/rc.local:
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if [ -x /etc/rc.d/rc.rtirq ]; then
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/etc/rc.d/rc.rtirq start
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fi
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The script can be disabled with "chmod -x /etc/rc.d/rc.rtirq".
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To enable IRQ threads, the option 'append="threadirqs"' needs to be
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added to the kernel section in /etc/lilo.conf. Example:
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# Linux bootable partition config begins
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image = /boot/vmlinuz-huge-3.10.17
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root = /dev/sda1
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label = Linux
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append = "threadirqs"
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read-only
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# Linux bootable partition config ends
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If there's already an 'append', add a space and 'threadirqs', like so:
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append = "noapic acpi=off threadirqs"
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Don't forget to run lilo after editing lilo.conf. The threadirqs option
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will take effect on the next reboot.
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