Messages in this thread | | | Date | Sat, 26 Oct 2002 11:58:02 -0700 | From | "Martin J. Bligh" <> | Subject | Re: Crunch time -- the musical. (2.5 merge candidate list 1.5) |
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>> I still haven't been able to get your scheduler to boot for about >> the last month without crashing the system. Andrew says he has it >> booting somehow on 2.5.44-mm4, so I'll steal his kernel tommorow and >> see how it looks. If the numbers look good for doing boring things >> like kernel compile, SDET, etc, I'm happy. > > I thought this problem is well understood! For some reasons independent of > my patch you have to boot your machines with the "notsc" option. This > leaves the cache_decay_ticks variable initialized to zero which my patch > doesn't like. I'm trying to deal with this inside the patch but there is > still a small window when the variable is zero. In my opinion this needs > to be fixed somewhere in arch/i386/kernel/smpboot.c. Booting a machine > with cache_decay_ticks=0 is pure nonsense, as it switches off cache > affinity which you absolutely need! So even if "notsc" is a legal option, > it should be fixed such that it doesn't leave your machine without cache > affinity. That would anyway give you a falsified behavior of the O(1) > scheduler.
Oh, not sure if I ever replied to this or not. I don't *have* to boot with notsc, I just usually do. And it crashed either way, so it's a different problem (changing versions of gcc seems to perturb it too). BUT ... your new patches 1 and 2 don't have this problem. See followup email in a second.
M.
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