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    SubjectRe: Possible bug in 2.6.34 slub
    On Tue, Jun 1, 2010 at 10:48 PM, Christoph Lameter
    <> wrote:
    > On Tue, 1 Jun 2010, Randy Dunlap wrote:
    >> > >>> My cpu is an I7 920, so it has 4 cores and there's hyperthreading
    >> > >>> enabled, so there are 8 logical cpus. Is this a bug?
    > Yes its a bug in the arch code or BIOS. The system configuration tells us
    > that there are more possible cpus and therefore the system prepares for
    > the additional cpus to be activated at some later time.

    I guess we should CC x86 maintainers then!

    >> Sorry, I think that I misread your report.
    >> It does look like misinformation.
    >> Let's cc Christoph Lameter & Pekka.
    >> > The point is, I guess(didn't actually look at the code), if that's
    >> > just the count of MAX number of cpus supported, which is a config time
    >> >  define and then the actual count gets refined afterwards by slub
    >> > too(because I know that the rest of the kernel knows I've got 4
    >> > cores/8 logical cpus) or not. Is that it? If this is not the case(that
    >> > is, it's not a static define used as a MAX value), then I can't see
    >> > what kind of boot/init time info it is. If it's a boot-time info, it
    >> > just means it's a _wrong_ boot-time info.
    > No that is the max nr of cpus possible on this machine. The count is
    > determined by hardware capabilities on bootup. If they are not detected
    > in the right way then you have the erroneous display (and the system
    > configures useless per cpu structures to support nonexistent cpus).
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