[arch-general] High lag in graphical applications

[Ralf Mardorf]

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