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wiki:system_configuration [2017/05/29 17:05] – [limits.conf/audio.conf] autostaticwiki:system_configuration [2017/05/30 19:03] autostatic
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 === Note about kernels === === Note about kernels ===
  
-  * Kernels >= 2.6.31 seem to work pretty good without RT patch, also for real-time pro audio usage. It's not strictly necessary anymore to install a real-time ('rt') kernel to get good results. Although the best results are still expected when using a real-time kernel. Try it, test it and decide for yourself. +  * Kernels >= 2.6.31 seem to work pretty well without RT patch, also for real-time pro audio usage. It's not strictly necessary anymore to install a real-time ('rt') kernel to get good results. Although the best results are still expected when using a real-time kernel. Try it, test it and decide for yourself. 
   * In the pre-2.6.39 kernel era rt kernels were indeed necessary in some cases where sound devices were sharing IRQ's with other peripherals. With the rt kernel and the rtirq script you could prioritize IRQ threads but since 2.6.39 it is possible to use the rtirq kernel with a generic kernel and the ''threadirqs'' kernel option.   * In the pre-2.6.39 kernel era rt kernels were indeed necessary in some cases where sound devices were sharing IRQ's with other peripherals. With the rt kernel and the rtirq script you could prioritize IRQ threads but since 2.6.39 it is possible to use the rtirq kernel with a generic kernel and the ''threadirqs'' kernel option.
   * Many distro kernels, and many third-party-provided real-time kernels, are configured without the 1000 Hz setting.  This is not significant for recording, but it can be an issue for live MIDI work if the application you're using does not rely on the ''snd-hrtimer'' kernel module.  If your application is live MIDI, using ALSA MIDI and relies on ''/dev/rtc'' (so it doesn't rely on the ''snd-hrtimer'' kernel module), you may well want real-time, but you certainly need 1000 Hz.   * Many distro kernels, and many third-party-provided real-time kernels, are configured without the 1000 Hz setting.  This is not significant for recording, but it can be an issue for live MIDI work if the application you're using does not rely on the ''snd-hrtimer'' kernel module.  If your application is live MIDI, using ALSA MIDI and relies on ''/dev/rtc'' (so it doesn't rely on the ''snd-hrtimer'' kernel module), you may well want real-time, but you certainly need 1000 Hz.
wiki/system_configuration.txt · Last modified: 2024/01/13 15:00 by autostatic