Dmitry Baikov wrote: > On 4/10/07, Robin Gareus <robin@xxxxxxxxxx> wrote: >> PCMCIA is ok, but not great for low latency. (adds one extra interface >> between PCI bus & sound-card). - the cheap solution is to get a PCMCIA >> card for your hard-disk - instead of using the built-in firewire for the >> disk. - maybe you want to do that anyway. use the built-in firewire to >> an external audio-device and the PCMCIA for storage. > > Quite the opposite. > PCMCIA is great for latency. That "extra" PCI bridge does NOT affect > audio latency. > Firewire latencies are bigger than PCI/PCMCIA and will always be. Ask > Pieter Palmers for details. good point. now I start to remember the protocol mess and overhead of 1394 audio. - and hope I'll forget about it again soon.. ;) > So if you are for low latency, PCI/PCMCIA is unbeatable. > If you want numbers, I can provide them for Echo Indigo IO and RME > MultifaceII. why not? a LAU-Poll can launch a "known to work professional gnu/linux sound setups and their specs&tweaks" wiki page.. I wanted to pull out some information of prev. emails and x-link archived emails to the linuxaudio.org wiki... maybe next weekend.. > Ask somebody to jdelay their Firewire card. it's not easy to interpret jdelay's output, is it? i get a lot of those running jdelay at 48kSPS -f64 -n2 for the UA-25. 24404.495 frames ?? Inv 24404.345 frames ?? 24404.241 frames ?? Inv 24404.181 frames ?? sometimes it "flips" and displays 44664.987 frames ?? 43225.215 frames ?? Inv 8585.183 frames ?? or other weird jumps that all add up to 48k. Then goes back to repeat the 24400 pattern. - i can tell that 24400/48000 is not the latency ;p and guess it means a total round trip latency of around 800 frames or 16 ms. btw. if i move a headphone relative to the mic, jdelay allows to track its distance with about a 2cm accuracy. how cool! the built-in HDA reports: 59328.024 frames ?? 59328.024 frames ?? Inv 59328.024 frames ?? 59328.024 frames ?? Inv 59328.024 frames ?? 59328.024 frames ?? Inv 59328.024 frames ?? 59328.024 frames ?? Inv 9608.520 frames ?? 9608.643 frames ?? Inv 9608.536 frames ?? Inv 9608.549 frames ?? 9608.485 frames ?? Inv 9608.449 frames ?? 59328.154 frames ?? Inv 59328.147 frames ?? 8584.172 frames ?? Inv 59328.193 frames ?? not sure how to make sense of that, yet. something's oscillating over here, where's the javascript-power-spectrum-paste-bin? lol. ;) #robin _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user
