* Federico Galland <federicogall...@gmail.com> [2014-04-15 17:46]: > On Tue, 15 Apr 2014 16:07:03 -0400 > "Peter P." <p8...@aol.com> wrote: > > > Hi list, > > > > following up onto some earlier postings I had made about the current > > problems running Pd with any buffersize larger(!) than 5 using alsa, > > the mmap code and an RME HDSP Multiface on Debian Linux, here are some > > more results from tests I made recently: > > > > Alsa only works with audiobuf smaller 6, otherwise causing totally > > garbled sound. With that short buffer settings it is unusable for > > everything more CPU intense than sine test tones though. > > > > The only way to get Pd to run reliably under some load on my box using > > the HDSP is to use jack with 256 frames at 2 periods/buffer. > > > > Now what is weird is that the built in soundcard of my box is able to > > do the same thing without problems with just 64 frames at 3 > > periods/buffer in jack. > > > > Again with the HDSP, once I start adding Gem and let it render a > > single geo, I do get many audio dropouts unless I increase jack's > > buffers to a minimum 2048 frames at 2 frames/buffer. > > > > I tested this using two different HDSP cards on two different Debian > > boxes, using the -rt flag, realtime and non-realtime kernels, > > optional callbacks and different sleegrain setting. > > > > Somehow it seems very sad that one of the best pro multichannel sound > > cards under Linux seems to be unusable with Pd under Alsa reliably. > > > > I would like to contribute to any ways of improving this situation and > > desperately hope that someone can comment on my findings. > > > > thank you! > > best, Peter > > > > _______________________________________________ > > Pd-list@iem.at mailing list > > UNSUBSCRIBE and account-management -> > > http://lists.puredata.info/listinfo/pd-list > > I guess you have ruled out everything under this wiki > http://wiki.linuxaudio.org/wiki/system_configuration ? Thank you Federico, I looked at the page and most suggesstions is stuff I already considered. > > Is the HDSP a PCI interface? If so, pay particular attention to the "pci bus > latency" part. Well it is a ExpressCard interface in my case, and I wonder if that qualifies as PCI device. The above pages mentions that PCIe devices are not affected by the irq priorities as PCI does.
best, Peter _______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
