On Thu, Jan 27, 2011 at 12:03 PM, Scott Lavender <span dir="ltr"><<a href="mailto:scottalavender@gmail.com">scottalavender@gmail.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im"><br><br><div class="gmail_quote">On Thu, Jan 27, 2011 at 10:13 AM, Scott Lavender <span dir="ltr"><<a href="mailto:scottalavender@gmail.com" target="_blank">scottalavender@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex"><font color="#888888"></font></blockquote><div class="gmail_quote"><div>My experience is that the -lowlatency performs in a far superior manner than the -generic one for audio work.<br>
<br>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.<br>
<br>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.<br><br>I hope all find this information useful.<br>
<br>ScottL<br></div><div> </div></div><br>
</blockquote></div><br></div>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.<br>
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<br></blockquote></div><br>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...<div>
<br></div><div>dont take my word for it though...</div><div><br></div><div>you can add abogani's ppa easily by reading <a href="https://launchpad.net/~abogani/+archive/ppa">https://launchpad.net/~abogani/+archive/ppa</a></div>
<div><br></div><div>and running in a terminal</div><div><br></div><div>sudo add-apt-repository ppa:abogani/ppa</div><div><br></div><div>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 <a href="http://ubuntu-tweak.com/">http://ubuntu-tweak.com/</a> 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... </div>
<div><br></div><div>IF you get a chance to test, let us know what you find and what hardware you are testing with.. </div><div><br></div><div>thanks</div><div><br></div><div><br></div><div><br clear="all"><br>-- <br>MH<div>
<br><a href="http://opensourcemusician.libsyn.com/" target="_blank">http://opensourcemusician.libsyn.com/</a></div><div><a href="http://wnclug.ourproject.org/" target="_blank">http://wnclug.ourproject.org/</a></div><br>
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