FWIW when running a stress test boot options might affect performance.
For my current session i915 has got low priority.
It might be of worth to care about this or similar pitfalls.
$ grep Threadirqs /boot/syslinux/syslinux.cfg -A5 | head -5
LABEL Threadirqs
MENU LABEL Arch Linux ^threadirqs
LINUX ../vmlinuz-linux
APPEND root=LABEL=s3.archlinux ro threadirqs
INITRD ../intel-ucode.img,../initramfs-linux.img
$ uname -rm
5.3.0-arch1-1-ARCH x86_64
$ rtirq status
PID CLS RTPRIO NI PRI %CPU STAT COMMAND
202 FF 90 - 130 0.0 S irq/16-ehci_hcd
205 FF 90 - 130 0.1 S irq/28-xhci_hcd
208 FF 89 - 129 0.0 S irq/23-ehci_hcd
393 FF 85 - 125 0.0 S irq/16-snd_hdsp
422 FF 80 - 120 0.0 S irq/16-snd_ice1
124 FF 50 - 90 0.0 S irq/9-acpi
138 FF 50 - 90 0.0 S irq/8-rtc0
201 FF 50 - 90 0.0 S irq/1-i8042
209 FF 50 - 90 0.0 S irq/29-ahci[000
319 FF 50 - 90 0.0 S irq/5-parport0
355 FF 50 - 90 0.0 S irq/30-mei_me
406 FF 50 - 90 0.0 S irq/18-i801_smb
452 FF 50 - 90 0.0 S irq/32-i915
^^^^^^^^^^ ^^^^
471 FF 50 - 90 0.0 S irq/33-snd_hda_
578 FF 50 - 90 0.0 S irq/31-enp3s0
9 TS - 0 19 0.0 S ksoftirqd/0
21 TS - 0 19 0.0 S ksoftirqd/1
