Re: [LAU] reducing xruns (System configuration)

Hi Jeanette, thank you for your advice.

On 18.07.2018 18:49, Jeanette C. wrote:
> for a start, do look at /proc/interrupts as suggestd by the script.

            CPU0 CPU1 CPU2 CPU3 CPU4 CPU5
      CPU6 CPU7
   0: 22 0 0 0 0 0
         0 0 IO-APIC 2-edge timer
   1: 0 0 0 0 0 0
       195 0 IO-APIC 1-edge i8042
   8: 0 0 0 0 0 0
         0 1 IO-APIC 8-edge rtc0
   9: 0 6144 0 0 0 0
         0 0 IO-APIC 9-fasteoi acpi

  12: 0 0 0 0 0 499
         0 0 IO-APIC 12-edge i8042

  16: 0 0 31 0 0 0
         0 0 IO-APIC 16-fasteoi ehci_hcd:usb1

  23: 0 0 0 35 0 0
         0 0 IO-APIC 23-fasteoi ehci_hcd:usb2

  24: 0 55975374 0 0 753 0
         0 0 PCI-MSI 327680-edge xhci_hcd

  25: 22 0 0 0 0 0
         0 0 PCI-MSI 1572864-edge rtsx_pci
  26: 0 14018 0 0 0 0
    350867 0 PCI-MSI 512000-edge ahci[0000:00:1f.2]
  27: 0 0 0 0 122 0
         0 581368 PCI-MSI 2097152-edge enp4s0
  28: 0 0 748 1746778 0 0
         0 0 PCI-MSI 32768-edge i915
  29: 0 0 0 18 0 0
         0 0 PCI-MSI 360448-edge mei_me
  31: 0 0 0 0 0 12035
         0 0 PCI-MSI 2621440-edge iwlwifi
  32: 0 0 0 0 0 0
        89 0 PCI-MSI 49152-edge snd_hda_intel:card0
  33: 0 0 0 0 0 0
         0 81843 PCI-MSI 442368-edge snd_hda_intel:card1
NMI: 229 233 244 137 188 99
      147 107 Non-maskable interrupts
LOC: 8147412 11215181 8654677 7200413 6723892 2734777
  4631806 2358955 Local timer interrupts
SPU: 0 0 0 0 0 0
        0 0 Spurious interrupts
PMI: 229 233 244 137 188 99
      147 107 Performance monitoring interrupts
IWI: 2900 885 1195 309101 1956 2702
     5074 3143 IRQ work interrupts
RTR: 0 0 0 0 0 0
        0 0 APIC ICR read retries
RES: 2223602 2119245 1217195 695903 667320 97291
   114748 73705 Rescheduling interrupts
CAL: 895506 552115 863706 521526 842682 695239
  1098867 768611 Function call interrupts
TLB: 842180 507316 819848 475430 799540 649222
  1055178 722638 TLB shootdowns
TRM: 0 0 0 0 0 0
        0 0 Thermal event interrupts
THR: 0 0 0 0 0 0
        0 0 Threshold APIC interrupts
DFR: 0 0 0 0 0 0
        0 0 Deferred Error APIC interrupts
MCE: 0 0 0 0 0 0
        0 0 Machine check exceptions
MCP: 86 87 87 87 87 87
       87 87 Machine check polls
HYP: 0 0 0 0 0 0
        0 0 Hypervisor callback interrupts
HRE: 0 0 0 0 0 0
        0 0 Hyper-V reenlightenment interrupts
HVS: 0 0 0 0 0 0
        0 0 Hyper-V stimer0 interrupts
ERR: 0
MIS: 0
PIN: 0 0 0 0 0 0
        0 0 Posted-interrupt notification event
NPI: 0 0 0 0 0 0
        0 0 Nested posted-interrupt event
PIW: 0 0 0 0 0 0
        0 0 Posted-interrupt wakeup event

I#m not sure how to read this table..

> Looking at /proc/asound/cards will also give you a list of your
> currently recognised ALSA soundcards.

cat /proc/asound/cards
  0 [HDMI ]: HDA-Intel - HDA Intel HDMI
                       HDA Intel HDMI at 0xf2610000 irq 32
  1 [PCH ]: HDA-Intel - HDA Intel PCH
                       HDA Intel PCH at 0xf2614000 irq 33
  2 [CODEC ]: USB-Audio - USB AUDIO CODEC
                       BurrBrown from Texas Instruments USB AUDIO CODEC
at usb-0000:00:14.0-1, full s

> Set the IRQ of the soundcard that you want to use for your realtime
> audio. And probably do it with:
> export VARIABLENAME=irq_number
> (if you're in bash/sh).

For the card 2 this would be
"export SOUND_CARD_IRQ=usb-0000:00:14.0-1" ?

> Next, you might want to check your swap-space. I had problems with that.
> My hard disk is a little slow and both swapping and recording/streaming
> from the same disk might cause issues. If you're drive is new and fast
> enough: don't worry.

It's a SSD. Not brand new, but reasonably fast I believe. I have a 2 GB
swap partition on the drive.

> If you're using JACK, check the periods and buffersize. Perhaps it's a
> little low.

It is.. :)

> The quickscan script didn't find your filesystem types, it appears,
> unless that was only the missing /tmp to which that "not found"
> referred. Check your partition filesystems. You can look at /etc/fstab
> or /etc/mtab. The first specifies how your partitions should be handled,
> but that might contain the odd automatic discovery. mtab gives you the
> status quo of everything currently mounted. Don't worry about all the
> /proc, /sys and /dev items.

I think I am only missing /tmp, but does it matter? The rest of the file
system is ext4

> In the end, you might want to install a kernel with realtime preemtion.
> Since it's kubuntustudio, I exptect they have a preemt kernel in their
> package repos.

I am using a lowlatency kernel in a normal kubuntu with kxstudio repos,
not ubuntustudio. Is that a problem?

thanks

m.
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Received on Thu Jul 19 00:15:01 2018