Re: usb audio popping on low cpu speed device

2013-01-03 Thread Shawn Lewis
On Thu, Jan 3, 2013 at 10:34 AM, Alan Stern wrote: > On Wed, 2 Jan 2013, Shawn Lewis wrote: > >> Am I understanding ehci correctly here? It looks like we only get an >> interrupt every 8ms even though the isochronous period is 1ms. That's >> because we can schedule 8

Re: usb audio popping on low cpu speed device

2013-01-02 Thread Shawn Lewis
ia an interrupt only after the 8th transaction completes. (basically I'm making sure I understand the division of labor between hardware and software). On Wed, Jan 2, 2013 at 8:39 AM, Alan Stern wrote: > On Tue, 1 Jan 2013, Shawn Lewis wrote: > >> Sure. These are from playing

Re: usb audio popping on low cpu speed device

2013-01-01 Thread Shawn Lewis
bmon-100Hz-wifi.txt On Tue, Jan 1, 2013 at 7:03 AM, Alan Stern wrote: > On Mon, 31 Dec 2012, Shawn Lewis wrote: > >> Hi list, I've been looking into an issue wherein a cheap usb sound >> card [1] plugged into a host system with a 400MHz mips core [2] makes >> audible p

usb audio popping on low cpu speed device

2012-12-31 Thread Shawn Lewis
Hi list, I've been looking into an issue wherein a cheap usb sound card [1] plugged into a host system with a 400MHz mips core [2] makes audible popping noises, at a rate of up to a few times per second. I don't believe the problem is at the application or alsa layers, as I don't get underflow erro