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Date: Wed, 02 Mar 2011 21:01:11 +0100 From: Uwaysi Bin Kareem <uwaysi.bin.kareem@...adoxuncreated.com> To: linux-kernel@...r.kernel.org, clemens@...isch.de Subject: Re: Possible bug, with extreme low latency audio. On Wed, 02 Mar 2011 08:28:50 +0100, Clemens Ladisch <clemens@...isch.de> wrote: > Uwaysi Bin Kareem wrote: >> The other is a firewire device (Konnekt24d using FFADO, running on the >> old >> firewire stack). >> The firewire device actually plays nicely without much buffer underruns >> down to 0.363 ms latency (8x2 @ 44.1k). > > FireWire packets are sent every 125 µs; for audio, every packet contains > either zero or eight samples, and the proportion of data and no-data > packets is adjusted so that the overall rate is 44100 samples per > second. So 8x2 is the theoretical minimum. > >> However it seems to choke at 8x2 @ 96k. > > At sample rates above 48 kHz, there are 16 samples per packet (and above > 96 kHz, 32). It is not possible to use 8x2 at 96 kHz, and FFADO should > not have allowed you to try it; please file a bug there: > <http://subversion.ffado.org/report> (requires a login). > Ok, I am hitting the hardware limits. I'll inform FFADO crew about this. There are probably more bound to hit this limit, as lowlatency operation with Linux, is getting this good. A good error msg with the above information, would be good. Best Regards, Uwaysi. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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