[LAU] reducing xruns (System configuration)

Hi list, I just re-installed my system partition with an kubuntu+kxstudio repositories and I get some xruns in Jack2. I am trying to figure out how to optimize my system configuration. realtimeconfigquickscan gives me this: == GUI-enabled checks == Checking if you are root... no - good Checking filesystem 'noatime' parameter... 4.17.7 kernel - good (relatime is default since 2.6.30) Checking CPU Governors... CPU 0: 'performance' CPU 1: 'performance' CPU 2: 'performance' CPU 3: 'performance' CPU 4: 'performance' CPU 5: 'performance' CPU 6: 'performance' CPU 7: 'performance' - good Checking swappiness... 10 - good Checking for resource-intensive background processes... none found - good Checking checking sysctl inotify max_user_watches... >= 524288 - good Checking access to the high precision event timer... readable - good Checking access to the real-time clock... readable - good Checking whether you're in the 'audio' group... yes - good Checking for multiple 'audio' groups... no - good Checking the ability to prioritize processes with chrt... yes - good Checking kernel support for high resolution timers... found - good Kernel with Real-Time Preemption... not found - not good Kernel without real-time capabilities found For more information, see http://wiki.linuxaudio.org/wiki/system_configuration#installing_a_real-time… Checking if kernel system timer is high-resolution... found - good Checking kernel support for tickless timer... found - good == Other checks == Checking filesystem types... ok. not found. ** Warning: no tmpfs partition mounted on /tmp For more information, see: - http://wiki.linuxaudio.org/wiki/system_configuration#tmpfs - http://lowlatency.linuxaudio.org ** Set $SOUND_CARD_IRQ to the IRQ of your soundcard to enable more checks. Find your sound card's IRQ by looking at '/proc/interrupts' and lspci. ------------------ ok, so I'm looking at lspci: 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller (rev 06) Subsystem: Lenovo Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller Flags: bus master, fast devsel, latency 0 Capabilities: [e0] Vendor Specific Information: Len=0c <?> Kernel modules: ie31200_edac 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0, IRQ 16 Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 I/O behind bridge: 00005000-00005fff Memory behind bridge: f0000000-f0ffffff Prefetchable memory behind bridge: 00000000c0000000-00000000d1ffffff Capabilities: [88] Subsystem: Lenovo Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller Capabilities: [80] Power Management version 3 Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [a0] Express Root Port (Slot+), MSI 00 Capabilities: [100] Virtual Channel Capabilities: [140] Root Complex Link Capabilities: [d94] #19 Kernel driver in use: pcieport Kernel modules: shpchp 00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06) (prog-if 00 [VGA controller]) Subsystem: Lenovo 4th Gen Core Processor Integrated Graphics Controller Flags: bus master, fast devsel, latency 0, IRQ 28 Memory at f1000000 (64-bit, non-prefetchable) [size=4M] Memory at e0000000 (64-bit, prefetchable) [size=256M] I/O ports at 6000 [size=64] [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [d0] Power Management version 2 Capabilities: [a4] PCI Advanced Features Kernel driver in use: i915 Kernel modules: i915 00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06) Subsystem: Lenovo Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller Flags: bus master, fast devsel, latency 0, IRQ 32 Memory at f2610000 (64-bit, non-prefetchable) [size=16K] Capabilities: [50] Power Management version 2 Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00 Kernel driver in use: snd_hda_intel Kernel modules: snd_hda_intel 00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 04) (prog-if 30 [XHCI]) Subsystem: Lenovo 8 Series/C220 Series Chipset Family USB xHCI Flags: bus master, medium devsel, latency 0, IRQ 24 Memory at f2600000 (64-bit, non-prefetchable) [size=64K] Capabilities: [70] Power Management version 2 Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+ Kernel driver in use: xhci_hcd 00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04) Subsystem: Lenovo 8 Series/C220 Series Chipset Family MEI Controller Flags: bus master, fast devsel, latency 0, IRQ 29 Memory at f2619000 (64-bit, non-prefetchable) [size=16] Capabilities: [50] Power Management version 3 Capabilities: [8c] MSI: Enable+ Count=1/1 Maskable- 64bit+ Kernel driver in use: mei_me Kernel modules: mei_me 00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 04) (prog-if 20 [EHCI]) Subsystem: Lenovo 8 Series/C220 Series Chipset Family USB EHCI Flags: bus master, medium devsel, latency 0, IRQ 16 Memory at f261e000 (32-bit, non-prefetchable) [size=1K] Capabilities: [50] Power Management version 2 Capabilities: [58] Debug port: BAR=1 offset=00a0 Capabilities: [98] PCI Advanced Features Kernel driver in use: ehci-pci 00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 04) Subsystem: Lenovo 8 Series/C220 Series Chipset High Definition Audio Controller Flags: bus master, fast devsel, latency 0, IRQ 33 Memory at f2614000 (64-bit, non-prefetchable) [size=16K] Capabilities: [50] Power Management version 2 Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00 Capabilities: [100] Virtual Channel Kernel driver in use: snd_hda_intel Kernel modules: snd_hda_intel 00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d4) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0, IRQ 16 Bus: primary=00, secondary=02, subordinate=02, sec-latency=0 I/O behind bridge: 00002000-00002fff Memory behind bridge: bfa00000-bfbfffff Prefetchable memory behind bridge: 00000000bfc00000-00000000bfdfffff Capabilities: [40] Express Root Port (Slot+), MSI 00 Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [90] Subsystem: Lenovo 8 Series/C220 Series Chipset Family PCI Express Root Port Capabilities: [a0] Power Management version 3 Kernel driver in use: pcieport Kernel modules: shpchp 00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 (rev d4) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0, IRQ 18 Bus: primary=00, secondary=03, subordinate=03, sec-latency=0 I/O behind bridge: 00004000-00004fff Memory behind bridge: f1e00000-f25fffff Prefetchable memory behind bridge: 00000000f1400000-00000000f1bfffff Capabilities: [40] Express Root Port (Slot+), MSI 00 Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [90] Subsystem: Lenovo 8 Series/C220 Series Chipset Family PCI Express Root Port Capabilities: [a0] Power Management version 3 Kernel driver in use: pcieport Kernel modules: shpchp 00:1c.3 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #4 (rev d4) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0, IRQ 19 Bus: primary=00, secondary=04, subordinate=04, sec-latency=0 I/O behind bridge: 00003000-00003fff Memory behind bridge: f1d00000-f1dfffff Capabilities: [40] Express Root Port (Slot+), MSI 00 Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [90] Subsystem: Lenovo 8 Series/C220 Series Chipset Family PCI Express Root Port Capabilities: [a0] Power Management version 3 Kernel driver in use: pcieport Kernel modules: shpchp 00:1c.4 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #5 (rev d4) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0, IRQ 16 Bus: primary=00, secondary=05, subordinate=05, sec-latency=0 Memory behind bridge: f1c00000-f1cfffff Capabilities: [40] Express Root Port (Slot+), MSI 00 Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [90] Subsystem: Lenovo 8 Series/C220 Series Chipset Family PCI Express Root Port Capabilities: [a0] Power Management version 3 Kernel driver in use: pcieport Kernel modules: shpchp 00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 04) (prog-if 20 [EHCI]) Subsystem: Lenovo 8 Series/C220 Series Chipset Family USB EHCI Flags: bus master, medium devsel, latency 0, IRQ 23 Memory at f261d000 (32-bit, non-prefetchable) [size=1K] Capabilities: [50] Power Management version 2 Capabilities: [58] Debug port: BAR=1 offset=00a0 Capabilities: [98] PCI Advanced Features Kernel driver in use: ehci-pci 00:1f.0 ISA bridge: Intel Corporation HM87 Express LPC Controller (rev 04) Subsystem: Lenovo HM87 Express LPC Controller Flags: bus master, medium devsel, latency 0 Capabilities: [e0] Vendor Specific Information: Len=0c <?> Kernel driver in use: lpc_ich Kernel modules: lpc_ich 00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 04) (prog-if 01 [AHCI 1.0]) Subsystem: Lenovo 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 26 I/O ports at 6088 [size=8] I/O ports at 6094 [size=4] I/O ports at 6080 [size=8] I/O ports at 6090 [size=4] I/O ports at 6060 [size=32] Memory at f261c000 (32-bit, non-prefetchable) [size=2K] Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [70] Power Management version 3 Capabilities: [a8] SATA HBA v1.0 Kernel driver in use: ahci Kernel modules: ahci 00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 04) Subsystem: Lenovo 8 Series/C220 Series Chipset Family SMBus Controller Flags: medium devsel, IRQ 255 Memory at f2618000 (64-bit, non-prefetchable) [size=256] I/O ports at efa0 [size=32] Kernel modules: i2c_i801 01:00.0 3D controller: NVIDIA Corporation GK208M [GeForce GT 740M] (rev a1) Subsystem: Lenovo GK208M [GeForce GT 740M] Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at f0000000 (32-bit, non-prefetchable) [size=16M] Memory at c0000000 (64-bit, prefetchable) [size=256M] Memory at d0000000 (64-bit, prefetchable) [size=32M] I/O ports at 5000 [size=128] Capabilities: [60] Power Management version 3 Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [78] Express Endpoint, MSI 00 Capabilities: [100] Virtual Channel Capabilities: [128] Power Budgeting <?> Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?> Capabilities: [900] #19 Kernel driver in use: nvidia Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia 03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader (rev 01) Subsystem: Lenovo RTS5227 PCI Express Card Reader Physical Slot: 1 Flags: bus master, fast devsel, latency 0, IRQ 25 Memory at f1e00000 (32-bit, non-prefetchable) [size=4K] Capabilities: [40] Power Management version 3 Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [70] Express Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting Capabilities: [140] Device Serial Number 00-00-00-01-00-4c-e0-00 Capabilities: [150] Latency Tolerance Reporting Capabilities: [158] L1 PM Substates Kernel driver in use: rtsx_pci Kernel modules: rtsx_pci 04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10) Subsystem: Lenovo RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller Flags: bus master, fast devsel, latency 0, IRQ 19 I/O ports at 3000 [size=256] Memory at f1d04000 (64-bit, non-prefetchable) [size=4K] Memory at f1d00000 (64-bit, non-prefetchable) [size=16K] Capabilities: [40] Power Management version 3 Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [70] Express Endpoint, MSI 01 Capabilities: [b0] MSI-X: Enable+ Count=4 Masked- Capabilities: [d0] Vital Product Data Capabilities: [100] Advanced Error Reporting Capabilities: [140] Virtual Channel Capabilities: [160] Device Serial Number 01-00-00-00-68-4c-e0-00 Capabilities: [170] Latency Tolerance Reporting Capabilities: [178] L1 PM Substates Kernel driver in use: r8169 Kernel modules: r8169 05:00.0 Network controller: Intel Corporation Wireless 7260 (rev 73) Subsystem: Intel Corporation Wireless-N 7260 Flags: bus master, fast devsel, latency 0, IRQ 31 Memory at f1c00000 (64-bit, non-prefetchable) [size=8K] Capabilities: [c8] Power Management version 3 Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [40] Express Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting Capabilities: [140] Device Serial Number 0c-8b-fd-ff-ff-66-0e-a9 Capabilities: [14c] Latency Tolerance Reporting Capabilities: [154] Vendor Specific Information: ID=cafe Rev=1 Len=014 <?> Kernel driver in use: iwlwifi Kernel modules: iwlwifi -------------- My guess is that IRQ 32 and 33 are the internal sound card, maybe one of them is the one that is serving the HDMI and the other one the headphone jack. Furthermore it looks like IRQ 16, 23 and 24 are USB controllers and on one of them might be the external soundcard since it is connected via USB.. Which number do I need to assign to the SOUND_CARD_IRQ variable? I assume it's an environment variable to be set like "SOUND_CARD_IRQ=23" in the terminal for realtimeconfigquickscan. However, even after setting the variable realtimeconfigquickscan still gives me the info that I should set the variable. Is this IRQ business still something I need to worry about? (since most info about it on the interwebs is from 2000 and prior). Please advise Thank you. m.