[LAU] reducing xruns (System configuration)

Ralf Mardorf ralf.mardorf at alice-dsl.net
Fri Jul 20 10:25:53 CEST 2018


On Thu, 19 Jul 2018 20:45:30 -1000, david wrote:
>On 07/19/2018 02:39 PM, someone back in the depths of time wrote:
>> On Fri, 20 Jul 2018 02:23:40 +0200, someone else back in the depths
>> of time wrote: "Hi,
>> 
>> the OP on Wed, 2018-07-18 at 21:28 +0200 wrote "64 buffer size at
>> 48kHz 2 Periods/Buffer" and the OP on Thu, 2018-07-19 at 14:32 +0200
>> wrote "Bus 003 Device 002: ID 08bb:29c2 Texas Instruments PCM2902C
>> Audio CODEC".
>> 
>> I'm not aware that a lot of people got this to work at all.  
>
>Don't know about a link to anything, but lsusb on my laptop just know 
>returned:
>
>Bus 003 Device 004: ID 08bb:2902 Texas Instruments PCM2902 Audio Codec
>
>> Where is the link to at least one of those many people using the
>> PCM2902C with 64 frames at 48K?  
>
>It's currently running with buffer size 512 and 3 periods at 48K, 
>10.7msec latency. On a non-RT kernel.

512 and 3 periods at 48K is not such a setup as the OP wants and we
were not arguing about non-RT kernels, we were arguing about non-rt
priority, you could use a generic Ubuntu kernel with 'threadirqs' to
get rt priority for USB devices. The lowlatency kernel is a non-rt
kernel, too, just with minor configuration changes, for the official
lowlatency kernel e.g. 'threadirqs' needs not to be added to the boot
line options.


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