<br><br><div class="gmail_quote">On Wed, Jan 26, 2011 at 9:25 AM, David Henningsson <span dir="ltr"><<a href="mailto:david.henningsson@canonical.com">david.henningsson@canonical.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;">
What is really the current status of the lowlatency kernel? Are we planning to have it in universe for Natty? If so, is any work going on in that area?<br></blockquote><div><br>Alessio answered most of these questions, however I would like to add a few more comments.<br>
<br>Alessio, would you please upload your -lowlatency kernel to the repository since there will be a delay in the documentation? I believe it is paramount to have the -lowlatency kernel in place for user experience and functionality.<br>
<br>I also would like to note that a few items about Alessio's kernel that have been explained to me:<br> * it is based on the -generic Ubuntu kernel<br> * it does NOT have an invasive patch as others have declared or believed<br>
* changes in build time flags ONLY are required to build Alessio's kernel<br><br>I apologize if I am being pedantic but sometimes I feel like this is an continually uphill battle, but it is one that I am committed.<br>
<br> </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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I talked to Andy Whitcroft yesterday about providing "derivative flavour" documentation, but he is currently busy with other tasks so this documentation will have to wait (no prognosis given). So I assume that waiting on that documentation is not an option.<br>
<br></blockquote><div><br>Again, I want to reiterate my desire to get the -lowlatency kernel into the repositories for a Natty release. Given that it is based on the -generic Ubuntu kernel and ONLY requires compile flags I would like to believe that this is possible.<br>
<br> </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Also, do we have any signs of this kernel performing better than the generic one? (As for bug 690010, that's fixed upstream now, and will be fixed in the generic kernel on the next Natty kernel upload.)<br>
<br>
<font color="#888888"><br></font></blockquote><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>