For a long time (years), I've been plauged with low performance and crashes. Kernel 5.18 was the first to actually be fairly stable for me. I always noticed there was 80%+ usage on one CPU core going back though LTS kernel and on other distros (this is also likely why some distros like Fedora will just crash within minutes of booting).
At first I looked at htop but no processes (even kernel processes) were taking more than a few percent with total generally coming out to less than 10% when not doing anything yet a single CPU core was still running at more than 80% which didn't make sense. Looking online everyone said to look at the interrupts, so I did.
System:
Kernel: 5.19.0-rc6-1-mainline arch: x86_64 bits: 64 compiler: gcc v: 12.1.0
parameters: BOOT_IMAGE=/@/boot/vmlinuz-linux-mainline
root=UUID=a55c4a54-0d20-415e-93d9-23fd6938b438 rw rootflags=subvol=@ splash
rd.udev.log_priority=3 vt.global_cursor_default=0
resume=UUID=f2faf51c-db74-457c-bb9d-eaf707594e6f loglevel=3 ibt=off
Desktop: KDE Plasma v: 5.25.3 tk: Qt v: 5.15.5 wm: kwin_x11 vt: 1 dm: SDDM
Distro: Garuda Linux base: Arch Linux
Machine:
Type: Convertible System: ASUSTeK product: ZenBook UX564EH_Q528EH v: 1.0
serial: <superuser required>
Mobo: ASUSTeK model: UX564EH v: 1.0 serial: <superuser required>
UEFI: American Megatrends LLC. v: UX564EH.312 date: 03/09/2022
Battery:
ID-1: BAT0 charge: 72.9 Wh (80.6%) condition: 90.5/96.0 Wh (94.3%) volts: 11.7 min: 11.7
model: ASUSTeK ASUS Battery type: Li-ion serial: N/A status: not charging cycles: 4
Device-1: hid-0018:04F3:2C26.0001-battery model: ELAN9009:00 04F3:2C26 serial: N/A charge: N/A
status: N/A
CPU:
Info: model: 11th Gen Intel Core i7-1165G7 bits: 64 type: MT MCP arch: Tiger Lake built: 2020
process: Intel 10nm family: 6 model-id: 0x8C (140) stepping: 1 microcode: 0xA4
Topology: cpus: 1x cores: 4 tpc: 2 threads: 8 smt: enabled cache: L1: 320 KiB
desc: d-4x48 KiB; i-4x32 KiB L2: 5 MiB desc: 4x1.2 MiB L3: 12 MiB desc: 1x12 MiB
Speed (MHz): avg: 2814 high: 4686 min/max: 400/4700 scaling: driver: intel_pstate
governor: powersave cores: 1: 4686 2: 3223 3: 1371 4: 2952 5: 4292 6: 400 7: 2792 8: 2800
bogomips: 44864
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Vulnerabilities:
Type: itlb_multihit status: Not affected
Type: l1tf status: Not affected
Type: mds status: Not affected
Type: meltdown status: Not affected
Type: mmio_stale_data status: Not affected
Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via prctl
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Enhanced IBRS, IBPB: conditional, RSB filling
Type: srbds status: Not affected
Type: tsx_async_abort status: Not affected
Graphics:
Device-1: Intel TigerLake-LP GT2 [Iris Xe Graphics] vendor: ASUSTeK driver: i915 v: kernel
arch: Gen12.1 process: Intel 10nm built: 2020-21 ports: active: HDMI-A-1,eDP-1 empty: DP-1,DP-2
bus-ID: 00:02.0 chip-ID: 8086:9a49 class-ID: 0300
Device-2: NVIDIA TU117M vendor: ASUSTeK driver: nvidia v: 515.57 alternate: nouveau,nvidia_drm
non-free: 515.xx+ status: current (as of 2022-06) arch: Turing process: TSMC 12nm built: 2018-22
pcie: gen: 3 speed: 8 GT/s lanes: 4 link-max: lanes: 16 bus-ID: 58:00.0 chip-ID: 10de:1f99
class-ID: 0302
Device-3: IMC Networks USB2.0 HD UVC WebCam type: USB driver: uvcvideo bus-ID: 3-5:3
chip-ID: 13d3:56eb class-ID: fe01 serial: <filter>
Display: x11 server: X.Org v: 21.1.4 with: Xwayland v: 22.1.3 compositor: kwin_x11 driver: X:
loaded: modesetting,nvidia gpu: i915 display-ID: :0 screens: 1
Screen-1: 0 s-res: 3840x1080 s-dpi: 96 s-size: 1016x285mm (40.00x11.22")
s-diag: 1055mm (41.54")
Monitor-1: HDMI-A-1 mapped: HDMI-1 pos: right model: Philips PHL 246E9Q serial: <filter>
built: 2022 res: 1920x1080 hz: 60 dpi: 93 gamma: 1.2 size: 527x296mm (20.75x11.65")
diag: 604mm (23.8") ratio: 16:9 modes: max: 1920x1080 min: 720x400
Monitor-2: eDP-1 pos: primary,left model: BOE Display 0x07d8 built: 2018 res: 1920x1080 hz: 60
dpi: 142 gamma: 1.2 size: 344x194mm (13.54x7.64") diag: 395mm (15.5") ratio: 16:9
modes: 1920x1080
OpenGL: renderer: Mesa Intel Xe Graphics (TGL GT2) v: 4.6 Mesa 22.1.3 direct render: Yes
Audio:
Device-1: Intel Tiger Lake-LP Smart Sound Audio vendor: ASUSTeK driver: sof-audio-pci-intel-tgl
alternate: snd_hda_intel,snd_sof_pci_intel_tgl bus-ID: 3-2.4.1:6 bus-ID: 00:1f.3
chip-ID: 046d:0a8f chip-ID: 8086:a0c8 class-ID: 0300 class-ID: 0401
Device-2: Logitech H390 headset with microphone type: USB
driver: hid-generic,snd-usb-audio,usbhid
Sound Server-1: ALSA v: k5.19
.0-rc6-1-mainline running: yes
Sound Server-2: sndio v: N/A running: no
Sound Server-3: PulseAudio v: 16.1 running: no
Sound Server-4: PipeWire v: 0.3.55 running: yes
Network:
Device-1: Intel Wi-Fi 6 AX201 driver: iwlwifi v: kernel bus-ID: 00:14.3 chip-ID: 8086:a0f0
class-ID: 0280
IF: wlo1 state: down mac: <filter>
Device-2: TP-Link UE300 10/100/1000 LAN (ethernet mode) [Realtek RTL8153] type: USB
driver: r8152 bus-ID: 4-2.3:3 chip-ID: 2357:0601 class-ID: 0000 serial: <filter>
IF: enp0s20f0u2u3 state: up speed: 1000 Mbps duplex: full mac: <filter>
Bluetooth:
Device-1: Intel AX201 Bluetooth type: USB driver: btusb v: 0.8 bus-ID: 3-10:7 chip-ID: 8087:0026
class-ID: e001
Report: bt-adapter ID: hci0 rfk-id: 3 state: up address: <filter>
Drives:
Local Storage: total: 504.19 GiB used: 91.51 GiB (18.1%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Intel model: HBRPEKNX0202A size: 476.94 GiB
block-size: physical: 512 B logical: 512 B speed: 15.8 Gb/s lanes: 2 type: SSD serial: <filter>
rev: G002 temp: 35.9 C scheme: GPT
ID-2: /dev/nvme1n1 maj-min: 259:4 vendor: Intel model: HBRPEKNX0202AO size: 27.25 GiB
block-size: physical: 512 B logical: 512 B speed: 15.8 Gb/s lanes: 2 type: SSD serial: <filter>
rev: K5110440 temp: 50.9 C scheme: GPT
Partition:
ID-1: / raw-size: 459.78 GiB size: 459.78 GiB (100.00%) used: 91.5 GiB (19.9%) fs: btrfs
dev: /dev/nvme0n1p2 maj-min: 259:2
ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%) used: 576 KiB (0.2%) fs: vfat
dev: /dev/nvme0n1p1 maj-min: 259:1
ID-3: /home raw-size: 459.78 GiB size: 459.78 GiB (100.00%) used: 91.5 GiB (19.9%) fs: btrfs
dev: /dev/nvme0n1p2 maj-min: 259:2
ID-4: /var/log raw-size: 459.78 GiB size: 459.78 GiB (100.00%) used: 91.5 GiB (19.9%)
fs: btrfs dev: /dev/nvme0n1p2 maj-min: 259:2
ID-5: /var/tmp raw-size: 459.78 GiB size: 459.78 GiB (100.00%) used: 91.5 GiB (19.9%)
fs: btrfs dev: /dev/nvme0n1p2 maj-min: 259:2
Swap:
Kernel: swappiness: 133 (default 60) cache-pressure: 100 (default)
ID-1: swap-1 type: zram size: 15.33 GiB used: 0 KiB (0.0%) priority: 100 dev: /dev/zram0
ID-2: swap-2 type: partition size: 16.86 GiB used: 0 KiB (0.0%) priority: -2
dev: /dev/nvme0n1p3 maj-min: 259:3
Sensors:
System Temperatures: cpu: 60.0 C mobo: N/A
Fan Speeds (RPM): cpu: 3200
Info:
Processes: 288 Uptime: 3h 1m wakeups: 3882 Memory: 15.33 GiB used: 4.52 GiB (29.5%)
Init: systemd v: 251 default: graphical tool: systemctl Compilers: gcc: 12.1.0 clang: 14.0.6
Packages: pacman: 1621 lib: 360 Client: shell wrapper v: 5.1.16-release inxi: 3.3.19
Garuda (2.6.4-2):
System install date: 2022-05-15
Last full system update: 2022-07-13 ↻
Is partially upgraded: No
Relevant software: NetworkManager
Windows dual boot: No/Undetected
Snapshots: Snapper
Failed units:
File: /proc/interrupts
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
1: 0 0 0 0 3214 0 0 0 IR-IO-APIC 1-edge i8042
8: 0 0 0 0 0 0 0 0 IR-IO-APIC 8-edge rtc0
9: 0 21 0 0 0 0 0 0 IR-IO-APIC 9-fasteoi acpi
14: 0 0 0 0 0 0 0 0 IR-IO-APIC 14-fasteoi INT34C5:00
16: 0 0 360 0 0 0 0 0 IR-IO-APIC 16-fasteoi intel_ish_ipc, i801_smbus
27: 0 0 0 0 0 1302 0 58819 IR-IO-APIC 27-fasteoi idma64.0, i2c_designware.0
28: 310868415 0 93 0 0 0 0 377636 IR-IO-APIC 28-fasteoi idma64.1, i2c_designware.1
29: 0 0 0 0 0 0 0 0 IR-IO-APIC 29-fasteoi idma64.2, i2c_designware.2
30: 0 0 0 0 0 0 0 0 IR-IO-APIC 30-fasteoi idma64.3, i2c_designware.3
43: 0 0 0 0 0 0 3150 0 IR-IO-APIC 43-fasteoi ELAN9009:00
57: 0 34765 0 0 0 0 0 0 IR-IO-APIC 57-fasteoi ELAN1206:00
120: 0 0 0 0 0 0 0 0 DMAR-MSI 2-edge dmar2
121: 0 0 0 0 0 0 0 0 DMAR-MSI 1-edge dmar1
122: 0 0 0 0 0 0 0 0 DMAR-MSI 0-edge dmar0
123: 0 0 0 0 0 0 0 0 DMAR-MSI 3-edge dmar3
124: 0 0 0 0 0 0 0 0 IR-PCI-MSI 114688-edge PCIe PME, pciehp
125: 0 0 0 0 0 0 0 0 IR-PCI-MSI 116736-edge PCIe PME, pciehp
126: 0 0 0 0 0 0 0 0 IR-PCI-MSI 458752-edge PCIe PME
127: 0 0 0 0 0 0 0 0 IR-PCI-MSI 466944-edge PCIe PME
128: 0 0 0 0 0 0 0 0 IR-PCI-MSI 475136-edge PCIe PME
129: 0 0 0 0 0 0 0 0 IR-PCI-MSI 479232-edge PCIe PME
130: 0 0 4629683 1437 4380 0 0 0 IR-PCI-MSI 32768-edge i915
131: 0 0 0 0 0 0 0 0 IR-PCI-MSI 212992-edge xhci_hcd
132: 0 1840046 0 0 890 0 16281 0 IR-PCI-MSI 327680-edge xhci_hcd
133: 0 19 8 0 0 0 0 0 IR-PCI-MSI 47185920-edge nvme1q0
134: 0 0 0 8 0 1 0 21 IR-PCI-MSI 46661632-edge nvme0q0
135: 9848 0 0 0 0 0 0 0 IR-PCI-MSI 46661633-edge nvme0q1
136: 0 27554 0 0 0 0 0 0 IR-PCI-MSI 46661634-edge nvme0q2
137: 0 0 31042 0 0 0 0 0 IR-PCI-MSI 46661635-edge nvme0q3
138: 0 0 0 41896 0 0 0 0 IR-PCI-MSI 46661636-edge nvme0q4
139: 0 0 0 0 30681 0 0 0 IR-PCI-MSI 46661637-edge nvme0q5
You can see IRQ 28 has millions of interrupts. Watching it with 1/2 second interval it goes up by tens of thousands each refresh when I am doing nothing. I looked up that driver (i2c designware) and some are saying it has to do with the touchpad (I have it disabled in KDE as I don't normally use it). So I tested touching the touchpad and noticed IRQ 43 going up only when I touched it. When I touch the touchsreen, IRQ 27 goes up.
Anyone know how to figure out what IRQ 28 is and maybe how to get it to stop slamming one of the CPU cores?
