I redid my tests, and found the -generic was less reliable for me after all. ScottL's testing did however show good performance from -generic
There are a few results to be found here: https://wiki.ubuntu.com/generic_vs_lowlatency_test_results These tests are still not very adequate, I think. Very practical and unscientific, but given enough time using the kernels and jackd in lower latencies, one will probably start to see trends. On 04/12/2011 05:30 AM, ailo wrote: > Pointless but funny test result from trying -lowlatency on AMD64 with > M-Audio 1010LT: > > jackd -d alsa -d hw:1 -p 16 -n 2 -r 96000 > > Latency showed in qjackctl at 0.333 ms. I get a few xruns, but not as > many as one would think. Not usable with audio programs, though. > > ------------------------------------ > > My initial tests on two machines (for a somewhat lengthy period of time): > > *-lowlatency* > > Kernel: linux-lowlatency 2.6.39-0 > System: Intel dual core 2.13GHz > Sound Device: HDA Intel (onboard) > Session: Simple Ardour and puredata usage > Lowest reliable jackd setting(without xruns): jackd -d alsa -p 64 / 2.9 ms > > Kernel: linux-lowlatency 2.6.39-0 > System: AMD Athlon X2 245 > Sound Device: M-Audio 1010LT > Session: Simple Ardour usage > Lowest reliable jackd setting: jackd -d alsa -p 32 / 1.45 ms > > *-generic* > > Kernel: linux-generic 2.6.38-8 > System: Intel dual core 2.13GHz > Sound Device: HDA Intel (onboard) > Session: Simple Ardour and puredata usage > Lowest reliable jackd setting(without xruns): jackd -d alsa -p 64 / 2.9 ms > > Kernel: linux-lowlatency 2.6.38-8 > System: AMD Athlon X2 245 > Sound Device: M-Audio 1010LT > Session: Simple Ardour usage > Lowest reliable jackd setting: jackd -d alsa -p 256 / 11.6 ms > > -------------------------- > > What is remarkable is how -generic and -lowlatency seem equal on the > Intel dual core, using the onboard sound device, while there is a huge > difference on the AMD64 machine with M-Audio 1010LT. > > > > > > > > On 04/11/2011 02:12 PM, Alessio Igor Bogani wrote: >> Dear Ubuntu Studio Developers, >> >> 2011/3/25 Alessio Igor Bogani <[email protected]>: >> [...] >>>> So I could provide a -lowlatency kernel based on 39 kernel if enough >>>> testers will offer theirs help. Sincerely I would want avoid to waste >>>> time for make something that no one will use. >> [...] >> >> You can find the 39-lowlatency(*) kernel at >> https://launchpad.net/~abogani/+archive/snmp++/+packages >> I suggest to install it manually (so without add the PPA). >> >> Now it's your turn testers! :-) >> >> Ciao, >> Alessio >> >> (*) Irq-threaded by default >> > > -- ailo -- Ubuntu-Studio-devel mailing list [email protected] Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-devel
