On Wed, Jan 26, 2011 at 9:25 AM, David Henningsson < [email protected]> wrote:
> 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? > Alessio answered most of these questions, however I would like to add a few more comments. 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. I also would like to note that a few items about Alessio's kernel that have been explained to me: * it is based on the -generic Ubuntu kernel * it does NOT have an invasive patch as others have declared or believed * changes in build time flags ONLY are required to build Alessio's kernel 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. > > 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. > > 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. > 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.) > > > 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
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