Where do I set threadirq flag?

[Tobbe]

Hi,

I see this mention, but it ain't telling me where to set it. I have lowlatency kernel installed so I wanna try it.

The lowlatency kernel might need the threadirqs boot flag.

[Jack Winter]

It's a kernel boot parameter, so would be set in the config file for your boot manager. Or if you have the possibility to change the boot parameters at boot time you can just add threadirqs when you boot.

If you have /proc/config.gz you can check how your kernel is configured. If zgrep CONFIG_IRQ_FORCED_THREADING /proc/config.gz is 'y' then you don't need it, and if 'n' then you do. Alternatively if ps aux | grep irq returns a lot of threads then you don't need it.

[Tobbe]

Thank you

[Tobbe]

Originally Posted by Jack Winter

It's a kernel boot parameter, so would be set in the config file for your boot manager. Or if you have the possibility to change the boot parameters at boot time you can just add threadirqs when you boot.

If you have /proc/config.gz you can check how your kernel is configured. If zgrep CONFIG_IRQ_FORCED_THREADING /proc/config.gz is 'y' then you don't need it, and if 'n' then you do. Alternatively if ps aux | grep irq returns a lot of threads then you don't need it.

Is this OK? Couldn't find /proc/config.gz.

root@homestudio:/home/tobbe# ps aux | grep irq
root         1  0.1  0.0 204844  7088 ?        Ss   15:51   0:01 /sbin/init threadirqs
root         7  0.0  0.0      0     0 ?        S    15:51   0:00 [ksoftirqd/0]
root        24  0.0  0.0      0     0 ?        S    15:51   0:00 [ksoftirqd/1]
root        33  0.0  0.0      0     0 ?        S    15:51   0:00 [ksoftirqd/2]
root        42  0.0  0.0      0     0 ?        S    15:51   0:00 [ksoftirqd/3]
root        59  0.0  0.0      0     0 ?        S    15:51   0:00 [irq/9-acpi]
root        80  0.0  0.0      0     0 ?        S    15:51   0:00 [irq/120-aerdrv]
root        81  0.0  0.0      0     0 ?        S    15:51   0:00 [irq/121-aerdrv]
root        82  0.0  0.0      0     0 ?        S    15:51   0:00 [irq/1-i8042]
root        83  0.0  0.0      0     0 ?        S    15:51   0:00 [irq/8-rtc0]
root       136  0.0  0.0      0     0 ?        S    15:51   0:00 [irq/16-i801_smb]
root       139  1.3  0.0      0     0 ?        S    15:51   0:08 [irq/123-xhci_hc]
root       140  0.1  0.0      0     0 ?        S    15:51   0:00 [irq/124-ahci[00]
root       281  0.0  0.0      0     0 ?        S    15:51   0:00 [irq/125-mei_me]
root       287  0.1  0.0      0     0 ?        S    15:51   0:01 [irq/126-i915]
root       297  0.3  0.0      0     0 ?        S    15:51   0:02 [irq/127-iwlwifi]
root       298  0.7  0.0      0     0 ?        S    15:51   0:04 [irq/127-s-iwlwi]
root       352  0.0  0.0      0     0 ?        S    15:51   0:00 [irq/128-snd_hda]
root       902  0.0  0.0      0     0 ?        S    15:51   0:00 [irq/122-enp2s0]
root      5596  0.0  0.0  12788   952 pts/1    S+   16:02   0:00 grep irq

[Jack Winter]

Yes, that's what you want to see. irq/128-snd_hda is your onboard soundcard, and irq/123-xhci_hc the usb root hub.