John Tomlinson wrote: > After a number of years of making successful music recordings using a > combination of rosegarden and ardour on my Ubuntu Dapper Drake system, > and my home grown real-time kernels, I thought it was time to upgrade to > Hardy Heron and use the proper real time kernel that the experts had > built. What a disappointment! > > I have an internal pci sound blaster live card (emu10k1 chip set) and a > M-audio audiophile USB sound module. > > On my dapper installation, which happened to have 2.6.22.1 real time > patched kernel (the default ubuntu kernel was 2.6.15), I could get > latencies as low as 1.5ms (32 frames/period) on the sound blaster and > 2.7ms ( 64 frames/period) on the USB Audiophile with very few xruns; so > few xruns that I used to wonder why people posted to mailing > lists/forums about the problem. > > With the stock Ubuntu 2.6.24-21rt kernel the sound blaster gives xruns > every few seconds with no load (no recording and no playing back) at > 23ms latency (512 frames/period) and the Audiophile struggles at 43ms > ( 1024 frames/period); I am getting xruns every 10-20 seconds. Infact > the rt kernel gives little, if any, improvement over the generic kernel. I cannot really help you here, but I can confirm that there are quite some FFADO users reporting xruns on the more recent ubuntu releases (Hardy and Intrepid), even with RT kernels. Personally I run Gutsy and even with the 2.6.22-15-generic kernel it hardly ever gives me xruns. Good to know that it might be a kernel scheduling issue, and not something in my code. Greets, Pieter _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
