SMP folding client uses one core on new kernel build
I'll post this here and if we come up with any ideas or solutions I'll ask Aedan to move the thread to the folding page.
My Xubuntu machine, like my 2 Ubuntu servers, runs a 126.96.36.199 kernel patched with Ingo Molnar's RealTime patch, and all 3 boxes fold with the SMP client problem-free.
I had a little free time on the weekend so I did some experimenting with the latest stable source[188.8.131.52, patched in the same way.] Using the same .config file as I used to build the other kernel I created .debs for the image and headers.
Everything installed fine, and seemed to work fine with the exception of folding - the new kernel does not utilize both cores on an Opteron-185. It uses one core to 100% while the other simply idles. Reinstalling the client did nothing. Booting into the old kernel, folding runs fine again.
I noticed that while setting up menuconfig there are a fair number of new options[some experimental]. I did not change any of the default settings on these, simply importing the .config file from the old kernel into the new build.
I know that the question is a bit esoteric, but what is the consensus on where to begin to look [in the kernel configuration] for what is preventing full core utilization, perhaps something related to SMP task scheduling or the like? Or am I overlooking something else?
Also, is there anyone out there who could either confirm or deny what I've experienced by building a kernel on 184.108.40.206 and trying the SMP client? I'm wondering if there's a bug. There are some reports on the forum of folks having trouble with 2.6.28, which is the standard distribution kernel in 9.04 Jaunty [the current Ubuntu/Xubuntu release].
I may have just proven my own argument for rolling release distros rather than scheduled release [read:rushed?] distros like Ubuntu.
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Last edited by ThunderRd; 18th May, 2009 at 10:52 AM.