[LAU] reducing xruns (System configuration)
Max
abonnements at revolwear.com
Wed Jul 18 19:27:26 CEST 2018
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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