Re: [FFADO-devel] Unexplainable glitches/droputs with 2 Saffire Pro40 interfaces

[Jörn N. <net...@st...>]

On 06/12/2012 12:10 AM, Nils Philippsen wrote:
> Hi there,
>
> since a few days I get unexplainable glitches (xruns) when using ardour
> or audacious ->  jack/ffado ->  two connected Saffire Pro40 interfaces.
> The symptom is playback stopping for 1-1.5 seconds, then resuming, which
> is annoying when trying to play to it.
>
> What's most unnerving is that this has been some kind of a progressive
> degradation, i.e. at one time (shortly after upgrading to Fedora 16)
> everything worked as smooth as one could imagine, even Youtube
> videos/flash and other "consumer audio" software (rhythmbox) via
> pulse->jack/ffado->saffire pro40. At one point YT videos started to
> "stutter", i.e. a glitch every half second or so (but no reported
> xruns). Then later, the pulse->jack bridge acted up and (re)introduced
> glitching, but jack-only setups weren't affected. And now even pure jack
> setups reliably glitch at least once every 5 minutes and that quite
> noticeably (as described, all things jack freeze for 1 to 1.5 seconds).

quick shot in the dark: if you have pinned your cpu at its maximum 
frequency (as is highly recommended for ffado), you may be running into 
thermal issues and the cpu might be clocking itself down erratically to 
protect itself. get the lm-sensors package going and watch your 
temperatures, and do a "watch grep MHz /proc/cpuinfo" to see what your 
cpu speeds are.



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