18 Aug
2017
18 Aug
'17
12:38 p.m.
On Fri, 2017-08-18 at 11:54 +0200, Jaromír Mikeš wrote:
irqbalance should be disabled?
"Disabling the irqbalance daemon
This daemon is enabled by default and periodically forces interrupts to
be handled by CPUs in an even, fair manner. However in realtime
deployments, applications are typically dedicated and bound to specific
CPUs, so the irqbalance daemon is not required." - https://access.redhat
.com/documentation/en-
US/Red_Hat_Enterprise_MRG/1.3/html/Realtime_Tuning_Guide/sect-
Realtime_Tuning_Guide-General_System_Tuning-
Interrupt_and_Process_Binding.html
I have different output for rtirq status with kernel
as one is only PREEMPT not RT
Seems to be that rtirq need RT kernel to work fully.
No, as already pointed out, if you should use a kernel without the rt
patch, you need to add "threadirqs" to the boot options.
For grub2's /boot/grub/grub.cfg it would probably look like this:
linux /boot/vmlinuz-foo root=bar 'ro' 'threadirqs'
I don't know where to add it for grub2's idiotic config for the config.
I'm using syslinux, so for /boot/syslinux/syslinux.cfg it definitively is:
APPEND root=bar ro threadirqs
/etc/init.d/rtirq status
PID CLS RTPRIO NI PRI %CPU STAT COMMAND
424 FF 90 - 130 0.0 S irq/31-snd_hda_
425 FF 85 - 125 6.0 S irq/19-ehci_hcd
429 FF 85 - 125 0.1 S irq/16-uhci_hcd
421 FF 84 - 124 0.0 S irq/23-ehci_hcd
431 FF 84 - 124 0.0 S irq/17-uhci_hcd
432 FF 83 - 123 0.0 S irq/18-uhci_hcd
420 FF 82 - 122 0.0 S irq/20-uhci_hcd
423 FF 81 - 121 0.0 S irq/21-uhci_hcd
66 FF 80 - 120 0.0 S irq/1-i8042
428 FF 80 - 120 0.0 S irq/22-uhci_hcd
65 FF 79 - 119 0.0 S irq/12-i8042
39 FF 50 - 90 0.0 S irq/9-acpi
57 FF 50 - 90 0.0 S irq/24-PCIe PME
58 FF 50 - 90 0.0 S irq/25-PCIe PME
59 FF 50 - 90 0.0 S irq/26-PCIe PME
60 FF 50 - 90 0.0 S irq/27-PCIe PME
61 FF 50 - 90 0.0 S irq/24-pciehp
62 FF 50 - 90 0.0 S irq/25-pciehp
63 FF 50 - 90 0.0 S irq/26-pciehp
64 FF 50 - 90 0.0 S irq/27-pciehp
67 FF 50 - 90 0.0 S irq/8-rtc0
105 FF 50 - 90 0.5 S irq/14-ata_piix
106 FF 50 - 90 0.0 S irq/15-ata_piix
408 FF 50 - 90 0.0 S irq/28-mei_me
409 FF 50 - 90 0.0 S irq/29-i915
418 FF 50 - 90 0.0 S irq/17-rtl_pci
419 FF 50 - 90 0.0 S irq/16-yenta
436 FF 50 - 90 0.0 S irq/23-i801_smb
610 FF 50 - 90 0.0 S irq/17-firewire
635 FF 50 - 90 0.0 S irq/18-mmc0
640 FF 50 - 90 0.0 S irq/18-r592
642 FF 50 - 90 0.0 S irq/18-r852
1061 FF 50 - 90 0.0 S irq/30-eth0
636 FF 49 - 89 0.0 S irq/18-s-mmc0
3 TS - 0 19 0.1 S ksoftirqd/0
22 TS - 0 19 0.1 S ksoftirqd/1
You are giving snd_hda_ the highest prio. Don't do it. It much likely is
an onboard device you aren't using for real-time audio.
You are giving i8042 real-time priority, don't give keyboard and mouse
this priority.
Simply edit /etc/conf.d/rtirq RTIRQ_NAME_LIST to:
RTIRQ_NAME_LIST="usb"
After that don't restart rtirq, restart the computer.
irq/16, irq/23, irq/17 and irq/18 share IRQs, so consider to use the
ehci (USB2) port using IRQ 19. Avoid using uhci (USB1) or the ehci
(USB2) port hat shares the IRQ.