[pulseaudio-discuss] Correct User Setup on an Embedded Device

jtharkey jtharkey at protonmail.com
Fri Jul 24 14:35:04 UTC 2020

Yes, we are dealing with very low latencies. Our embedded device is a pinball machine. Yes, the performance improvements in user-mode are measurably better just by looking at percentages in top. I can't even get playback in system-mode to be without static (i don't know what else to call it). In user-mode it sounds perfect.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, July 24, 2020 9:27 AM, Arun Raghavan <arun at arunraghavan.net> wrote:

> On Fri, 24 Jul 2020, at 8:29 AM, jtharkey wrote:
> > We're trying to get away from running PA in system mode on an embedded
> > device because of performance. We have the problem that our app must
> > run as root, however. Right now I'm doing this:
> > We have two users on the system, root and the app's
> > The app's user logs in and runs PA
> > The app's user sudos the app to run as root
> > This works great except it breaks bluetooth audio support. Is this the
> > correct way to go about this or do we need to change our approach?
> Are you working with very low latencies, or such? And have you been able to measure a performance improvement in user-mode?
> Because outside of low latency use-cases, I'd expect the memcpy() overhead on most modern systems is small enough to not be a deciding factor.
> Cheers,
> Arun

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