[LAU] help request: RT audio checkup and xorg's xruns

Nicola Pandini nicola.pandini at gmail.com
Mon Aug 24 19:16:33 CEST 2020

Thank you David,
I kept i8042 in RTIRQ_NAME_LIST because it was present in the default 
configuration of rtirq. I have now removed it from RTIRQ_NAME_LIST, but 
the situation doesn't seem to have changed.

Shared memory:
I don't know how to find it, could you please tell me how to check it out?
Here is the lspci for the video interface:

00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core 
Processor Integrated Graphics Controller (rev 06) (prog-if 00 [VGA 
     Subsystem: ASUSTeK Computer Inc. 4th Gen Core Processor Integrated 
Graphics Controller
     Flags: bus master, fast devsel, latency 0, IRQ 36
     Memory at f7400000 (64-bit, non-prefetchable) [size=4M]
     Memory at d0000000 (64-bit, prefetchable) [size=256M]
     I/O ports at f000 [size=64]
     [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
     Capabilities: <access denied>
     Kernel driver in use: i915
     Kernel modules: i915

01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 850M] (rev a2)
     Subsystem: ASUSTeK Computer Inc. GM107M [GeForce GTX 850M]
     Flags: bus master, fast devsel, latency 0, IRQ 255
     Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
     Memory at e0000000 (64-bit, prefetchable) [size=256M]
     Memory at f0000000 (64-bit, prefetchable) [size=32M]
     I/O ports at e000 [size=128]
     Expansion ROM at f7000000 [disabled] [size=512K]
     Capabilities: <access denied>
     Kernel modules: nouveau

Il 23/08/20 06:35, David W. Jones ha scritto:
> I don't know about the rest of the settings, but why is i8042 (PS/2 
> keyboard/mouse controller) on the RTIRQ_NAME_LIST?
> Does the laptop use shared system memory for video?
> On August 22, 2020 12:29:58 PM HST, Nicola Pandini 
> <nicola.pandini at gmail.com> wrote:
>     Hello list!
>     I have a setup that I use in my live sets made with an ASUS N551 laptops
>     and a NI Komplete Audio 6, which allows me to play without XRUNS at 64
>     frames / period with a modular approach (Qtractor, LinuxSampler,
>     Yoshimi, SooperLooper, PureData).
>     The whole thing runs on Debian Stretch with AVLinux 4.9.47-rt37avl2 kernel.
>     I am quite happy with the performance of this setup, but I started
>     having XRUNS when I added real-time video management as well. Those
>     issues made me notice that the system runs without XRUNS only if XOrg is
>     not stressed much, while it starts producing XRUNS when I play a video,
>     or when I open the browser, or even when I quickly move or resize a window.
>     I would like to understand if the problem is due to an incorrect
>     configuration of realtime priorities, or to something that I have not
>     yet managed to trap.
>     I currently use these configurations:
>     [Xorg]
>     The video driver is i915.
>     I read on the internet that:
>     "If your graphic card was manufactured in 2007 and newer, try
>     uninstalling the xserver-xorg-video-intel package and use the builtin
>     modesetting driver (xserver-xorg-core) instead"
>     Questions:
>     - I uninstalled xserver-xorg-video-intel, but I still see the i915
>     driver: is that correct, or should I see another driver?
>     [rtirq]
>     RTIRQ_NAME_LIST = "snd usb i8042"
>     RTIRQ_PRIO_HIGH = 90
>     RTIRQ_PRIO_LOW = 51
>     RTIRQ_NON_THREADED = "rtc snd"
>     Questions:
>     - rtc must be in "NON_THREADED", or in "RTIRQ_NAME_LIST"?
>     - in "RTIRQ_NAME_LIST" can I remove "usb" and put only the item that
>     manages my USB card? Should it be xhci?
>     - can i take i8042 off the list?
>     - is it recommended to use RTIRQ_RESET_ALL = 1 to override all other IRQs?
>     [jackd]
>     jackd -P83 -dalsa -dhw: K6 -r44100 -p64 -n2 -I1
>     Questions:
>     - the priority must be lower than those that are set to the IRQs by rtirq?
>     [limits.conf]
>     @audio - rtprio 99 # maximum realtime priority
>     @audio - memlock unlimited # maximum locked-in-memory address space (KB)
>     Questions:
>     - what is the recommended value of rtprio in 2020? On the internet I
>     find 90, 95 and 99
>     Can you help me do a checkup of my configuration?
>     Thanks!
> ------------------------------------------------------------------------
> David W. Jones
> gnome at hawaii.rr.com
> authenticity, honesty, community
> http://dancingtreefrog.com
> Sent from my Android device with F/LOSS K-9 Mail.
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> https://lists.linuxaudio.org/listinfo/linux-audio-user

Nicola Pandini

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