[pulseaudio-discuss] Multi user access to PulseAudio
tanuk at iki.fi
Sun Sep 11 12:05:38 UTC 2016
On Sun, 2016-09-11 at 14:56 +0300, Tanu Kaskinen wrote:
> On Sun, 2016-09-11 at 13:30 +0200, Pali Rohár wrote:
> > On Sunday 11 September 2016 13:10:53 Ralph Benzinger wrote:
> > >
> > > Actually looking at "what is wrong with system mode?", all security
> > > issues are moot for me, as I own all the users on the system. But
> > > the point
> > >
> > > When in system mode, shared memory data transport is disabled for
> > > security reasons, which means: much higher memory usage and CPU
> > > load in system mode
> > >
> > > does sound bad. Could someone quantify this statement so that one
> > > might see if this is an actual issue (rather than a mere fact) on a
> > > modern desktop system?
> I doubt that the statement in the wiki is based on any real benchmarks.
> I believe the performance benefit of shm is negligible in most cases.
> With very low latencies it starts to matter, though.
> For example, I worked on the Nokia N900, a smartphone with 600 MHz
> single-core ARM processor, and we used PulseAudio in the system mode
> without shared memory, and the lack of shm caused no performance
> problems. The same thing with the later N9 phone.
(Sorry for sending so many mails...) Now I realized that benchmarks
wouldn't matter anyway - we always disable SHM when the server and
client are under different users.
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