Re: [LAU] UA25 noise problem w. nVidia chipset

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To: Dave Phillips <dlphillips@...>
Cc: LAU <linux-audio-user@...>
Date: Wednesday, April 6, 2011 - 10:53 pm

On Wed, Apr 6, 2011 at 3:34 PM, Dave Phillips wrote:

What does

lsusb

and

lsusb -t

tell you? Are these two USB devices on different buses using different
controllers & different interrupts?

With no audio running if you move the mouse and watch /proc/interrupts
you should be able to see which interrupt is being used. HEre are a
couple of measurements. The first is a baseline. The second is the
system sitting quiet for 1 minute. Note that Int16 didn't change. The
third is after me moving the mouse for 1 minute. Clearly Int16 jumped
a lot, as expected.

I don't have a USB audio device but you can run the same tests using
USB audio and not using the mouse. (much)

This is a 12-core SMP machine which is why there are so many 0's in each row.

Hope this helps,
Mark

cat /proc/interrupts | grep usb

c2stable ~ # date && cat /proc/interrupts | grep usb
Wed Apr 6 15:48:00 PDT 2011
16: 506693 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi ahci, uhci_hcd:usb3
18: 35414 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb8
19: 0 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi uhci_hcd:usb5, uhci_hcd:usb7
21: 0 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi uhci_hcd:usb4
23: 2 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb6
c2stable ~ # date && cat /proc/interrupts | grep usb
Wed Apr 6 15:49:00 PDT 2011
16: 506693 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi ahci, uhci_hcd:usb3
18: 35471 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb8
19: 0 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi uhci_hcd:usb5, uhci_hcd:usb7
21: 0 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi uhci_hcd:usb4
23: 2 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb6
c2stable ~ # date && cat /proc/interrupts | grep usb
Wed Apr 6 15:50:00 PDT 2011
16: 513590 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi ahci, uhci_hcd:usb3
18: 35534 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb8
19: 0 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi uhci_hcd:usb5, uhci_hcd:usb7
21: 0 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi uhci_hcd:usb4
23: 2 0 0 0 0 0
0 0 0 0 0 0
IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb6
c2stable ~ #

- Mark
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Messages in current thread:
[LAU] UA25 noise problem w. nVidia chipset, Dave Phillips, (Wed Apr 6, 10:34 pm)
Re: [LAU] UA25 noise problem w. nVidia chipset, S. Massy, (Fri Apr 8, 1:03 am)
Re: [LAU] UA25 noise problem w. nVidia chipset, Jeremy Jongepier, (Fri Apr 8, 6:35 am)
Re: [LAU] UA25 noise problem w. nVidia chipset, Philipp √úberbacher, (Fri Apr 8, 7:39 am)
Re: [LAU] UA25 noise problem w. nVidia chipset, S. Massy, (Fri Apr 8, 4:44 pm)
Re: [LAU] UA25 noise problem w. nVidia chipset, Giso Grimm, (Thu Apr 7, 7:46 am)
Re: [LAU] UA25 noise problem w. nVidia chipset, Arnold Krille, (Thu Apr 7, 6:25 am)
Re: [LAU] UA25 noise problem w. nVidia chipset, Mark Knecht, (Wed Apr 6, 10:53 pm)