Messages in this thread | | | Date | Wed, 12 Apr 2006 08:17:15 +0200 | From | Ingo Molnar <> | Subject | Re: PREEMPT_RT : 2.6.16-rt12 and boot : BUG ? |
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* Serge Noiraud <serge.noiraud@bull.net> wrote:
> Hi, > > It now works with all config parameters set to yes on 2.6.16-rt16. > however, PERCPU_ENOUGH_ROOM is set to 384KB. > I'm now trying to lower this value of PERCPU_ENOUGH_ROOM. > With 256K and 2.6.16-rt16 : doesn't work. > With 320K : OK > So I need to use 320K for PERCPU_ENOUGH_ROOM to boot correctly.
great detective work! I've increased it to 512K in my tree, to be on the safe side. I'm not sure which parameter takes so much per-cpu space. There's certainly no problem with your config, this must be something caused by the -rt tree. The -rt tree introduces a new per-cpu concept (called PER_CPU_LOCKED) which is used in a couple of cases, but it shouldnt cause this drastic increase of the per-cpu area's size. Weird.
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