Re: [FFADO-user] Corrupted MIDI output above 48 kHz, port naming, XRUNs when windows redraw

[Clemens L. <cl...@la...>]

Chris Edwards wrote:
> Hardware Interrupt Rates
> ------------------------
>
> I've also noticed that using the AudioFire produces much higher
> hardware interrupt rates (over 6,000 per second running jackd with
> -dfirewire -r96000 -p128 -n3) than my Echo Gina24 PCI.  Is this to be
> expected for Firewire audio?

FireWire uses 8000 packets per second.  Not every packet needs to be
acknowledged with an interrupt, but FFADO doesn't know exactly how many
samples will be received in each packet, so there needs to be more than
one interrupt per period to ensure that FFADO gets woken up shortly
enough after a complete period has been received.  Furthermore, the
interrupts for the playback and capture streams are not guaranteed to
happen at the same time.


Regards,
Clemens