2017-08-18 0:36 GMT+02:00 Ralf Mardorf <ralf.mardorf@alice-dsl.net>:

Hi Ralf,

is it a 1st Gen or 2nd Gen?

2nd gen

I've got a 18i20 2nd Gen, -n 2 -p 128 works with my outdated Athlon
and now with my Celeron without issues. IOW even my new machine hasn't
got much horsepower.

If irqbalance should be enabled, disable it.

irqbalance should be disabled?

Did you already test
different USB ports?

Yes I tried ... seems to be very similar on all USB ports

What's the output of

/path/to/rtirq status

What kernel are you using?

uname -a

Actually I am playing with two different kernels which seems to be fine for RT task and are available from repositories.

I don't want to spend time to build my own kernels ...

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.

Anyway I am getting same performance with both kernels.

4.12.0-8.1-liquorix-amd64 #1 ZEN SMP PREEMPT liquorix 4.12-1 (2017-08-17) x86_64 GNU/Linux

/etc/init.d/rtirq status

PID CLS RTPRIO NI PRI %CPU STAT COMMAND
654 FF      80   - 120 0.0 S    irq/18-mmc0
   58 FF      50   - 90 0.0 S    irq/28-mei_me
    7 TS       -   0 38 0.0 S    ksoftirqd/0
   18 TS       -   0 38 0.0 S    ksoftirqd/1

-------------------------------------------------------

Linux mira-laptop 4.9.33-rt23avl1 #3 SMP PREEMPT RT Sun Jul 2 21:55:59 EDT 2017 x86_64 GNU/Linux

/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

Let me know if sth could be tweaked.

best regards

mira