On Thu, Jan 27, 2011 at 12:03 PM, Scott Lavender <[email protected]>wrote:
> > > On Thu, Jan 27, 2011 at 10:13 AM, Scott Lavender <[email protected] > > wrote: > >> My experience is that the -lowlatency performs in a far superior manner >> than the -generic one for audio work. >> >> Using my Dell P4, 2.8ghz machine with 3 gigs memory and an MAudio Delta 44 >> card I test the -generic kernel using JACK and Ardour and made test >> recordings of guitar. I found that the -generic kernel provided stable >> performance (i.e. no xruns) at slightly over 22msecs. >> >> Using the same machine I installed Alessio's -lowlatency kernel and >> testing it in the same manner. I found that the -lowlatency kernel provided >> stable performance (i.e. no xruns) at just under 3msecs. >> >> I hope all find this information useful. >> >> ScottL >> >> >> > I should point out that my the performance experienced with the -generic > kernel suffered from not being able to have real-time privileges presumably > due to the bug mentioned above. > > -- > Ubuntu-Studio-devel mailing list > [email protected] > Modify settings or unsubscribe at: > https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-devel > > in lucid, i use the -realtime kernel with my firewire device regularly... i have tested the -lowlatency kernel in both maverick and natty (more in natty) and it seems i can actually push my JACK settings a little more... im not positive this is happening, and there are more variables than kernel involved, but the -lowlatency kernel in natty is at least as good performance wise for me as lucid with -realtime... i use a presonus firepod, and i test with JACK running around 1.2ms latency (not that i need it that low usually)... the generic kernel is a no-go for me using firewire + JACK... i have a pretty strict zero xrun policy, so i cant say i get less xruns, i get 1 or 2 here or there opening an application, but not during normal operation... dont take my word for it though... you can add abogani's ppa easily by reading https://launchpad.net/~abogani/+archive/ppa and running in a terminal sudo add-apt-repository ppa:abogani/ppa then, you can install both linux-realtime and/or linux/lowlatency in natty and see how your hardware works... assuming this is a test install of natty anyways, you are probably not worried about adding PPA's, but http://ubuntu-tweak.com/ has a very nice and easy GUI way to purge PPA's and the PPA's packages from the system that i have used in lucid... IF you get a chance to test, let us know what you find and what hardware you are testing with.. thanks -- MH http://opensourcemusician.libsyn.com/ http://wnclug.ourproject.org/
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