[mythtv-users] Kernel options, Preemption model and Timer frequency

[Hika van den Hoven]

Hoi Rajil,

Saturday, May 12, 2018, 11:24:41 PM, you wrote:

> On 05/12/2018 04:01 PM, Hika van den Hoven wrote:

> I infer that you       have separate back and frontend. What are the specks,
> - what else are they doing while you are watching?
> - what else is going on on your network?
> - how is the health statust of your drives?

> Just a few questions to answer first



>   
>      The backend is xeon server with 16GB memory with OS on SSD.
> The     backend is not much loaded (load average: 0.23, 0.21, 0.14).
> The     frontend is a high spec machine xeon machine as well with
> not much     load (also on SSD). The network is 1G between the machines.
>   
>      One of the potential issues on the FE is that i am using a USB
> sound     card (0ccd:0028 TerraTec Electronic GmbH Aureon 5.1 MkII).
> I get the following messages on startup,

> 2018-05-12 15:43:08.631560 I  AOBase: Opening audio device
> 'default:CARD=Aureon51MkII' ch 2(2) sr 48000 sf signed 16 bit reenc 0
> 2018-05-12 15:43:08.635287 W  ALSA: Requested 500000us got 341333 buffer time
> 2018-05-12 15:43:08.635324 E  ALSA: Error opening
> /proc/asound/card1/pcm0p/sub0/prealloc. Fix reading permissions.
> 2018-05-12 15:43:08.637639 E  ALSA: failed to register mixer device
> /dev/mixer: No such file or directory


> Myth is trying to do some preallocation, but i dont have this setting for the USB sound card,

> $ ls -la /proc/asound/card1/pcm0p/sub0/prealloc
> ls: cannot access '/proc/asound/card1/pcm0p/sub0/prealloc': No such file or directory



> These issues may likely be due to FE setup, however I am still
> interested in the best kernel options for the BE.
>     

Is your user member of both the audio and the usb group?

For the backend I, as it is dedicated I would use default server
settings. Other choices are mostly aimed at a reactive desktop. So
No forced preemption and a low timer frequency.

Tot mails,
  Hika                            mailto:hikavdh at gmail.com

"Zonder hoop kun je niet leven
Zonder leven is er geen hoop
Het eeuwige dilemma
Zeker als je hoop moet vernietigen om te kunnen overleven!"

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