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    SubjectRe: PREEMPT_RT : 2.6.16-rt12 and boot : BUG ?
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    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.

    I have several questions :
    Is there a problem in my config file ?
    Will this memory freed at end of kernel loading ?
    Why do we need such a size ?
    What usage is this for ?

    lundi 10 Avril 2006 14:46, Serge Noiraud wrote/a écrit :
    > jeudi 6 Avril 2006 17:05, Serge Noiraud wrote/a écrit :
    > > jeudi 6 Avril 2006 16:31, Ingo Molnar wrote/a écrit :
    > > >
    > > > * Serge Noiraud <serge.noiraud@bull.net> wrote:
    > > >
    > > > > input: ImPS/2 Generic Wheel Mouse as /class/input/input1
    > > > > VFS: Mounted root (ext2 filesystem).
    > > > > Fusion MPT base driver 3.03.07
    > > > > Copyright (c) 1999-2005 LSI Logic Corporation
    > > > > Could not allocate 8 bytes percpu data
    > > > > mptscsih: Unknown symbol scsi_remove_host
    > > >
    > > > could you increase (double) PERCPU_ENOUGH_ROOM in
    > > > include/linux/percpu.h, does that solve this problem? (and make sure you
    > > > use -rt13, -rt12 had a couple of bugs)
    > > Tested with rt12 and 192K : same problem
    > > Tested with rt12 and 256K : same problem.
    > > Tested with rt13 and 256K : same problem.
    > > I'm currently compiling with CONFIG_KALLSYMS_ALL not set.
    > Same thing.
    >
    > The boot succeed if I set CONFIG_CRITICAL_IRQSOFF_TIMING to no.
    > If I set this parameter to yes, I get the scsi unresolved symbols.
    > PERCPU_ENOUGH_ROOM is actually set to 256K.
    > I'll try to set the original value.
    it didn't work with CONFIG_CRITICAL_IRQSOFF_TIMING set to no and PERCPU_ENOUGH_ROOM = 128K.
    >
    > I don't see the relation between this parameter and the missing scsi symbols resolution.
    > Timing problem ?
    >
    > > >
    > > > Ingo
    >

    --
    Serge Noiraud
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