normal Linux kernels with threadirqs vs RT patchset

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Luc
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Re: normal Linux kernels with threadirqs vs RT patchset

Postby Luc » Thu Sep 17, 2015 1:03 pm

SR wrote:Maybe you have a UEFI system. Do you have /boot/efi?

No, it's MBR. I'm old school like that. :wink:

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Be.
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Re: normal Linux kernels with threadirqs vs RT patchset

Postby Be. » Fri Sep 18, 2015 2:51 am

English Guy wrote:I have been told the rt is more important with usb devices; might be worth bearing that in mind with testing. What system says the latency is and the xruns you get in certain scenarios are two different things.


CrocoDuck wrote:With my actual setup, Compaq Presario CQ61 + ArchBang + Focusrite Scarlett 2i4, I can hardly do stuff without RT (RT LTS from Archaudio repos). However, my laptop has always been a pain with USB audio devices...


Have you raised the IRQ priority of your USB sound card? That makes a pretty big difference for me using the sound card in a Native Instruments Kore.

Luc wrote:I don't know if the changes were applied. You never know with computers.


/proc/cmdline is a plain text file that shows the options the currently running kernel was booted with. Look at it with cat or less to confirm that you booted with threadirqs.

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CrocoDuck
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Re: normal Linux kernels with threadirqs vs RT patchset

Postby CrocoDuck » Mon Sep 21, 2015 5:43 pm

Be. wrote:
Have you raised the IRQ priority of your USB sound card? That makes a pretty big difference for me using the sound card in a Native Instruments Kore.


I have configured rtirq for that. Do you think I should do something more?
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artek
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Re: normal Linux kernels with threadirqs vs RT patchset

Postby artek » Tue Sep 22, 2015 5:11 pm

best way to find if threadirqs are enabled on the system is to grep them:

Code: Select all

ps ax | grep "\[irq"

the output should be something like that:

Code: Select all

   96 ?        S      0:00 [irq/26-xhci_hcd]
   97 ?        S      0:00 [irq/27-xhci_hcd]
   98 ?        S      0:00 [irq/28-xhci_hcd]
   99 ?        S      0:00 [irq/29-xhci_hcd]
  100 ?        S      0:07 [irq/17-ehci_hcd]
  101 ?        S      0:06 [irq/17-ehci_hcd]
  102 ?        S      0:20 [irq/18-ohci_hcd]
  103 ?        S      0:10 [irq/18-ohci_hcd]
  104 ?        S      0:00 [irq/12-i8042]
  105 ?        S      0:00 [irq/1-i8042]


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