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    SubjectRe: [patch] x86: 2.6.31-rc7 crash due to buggy flat_phys_pkg_id
    Ravikiran G Thirumalai wrote:
    > On Tue, Aug 25, 2009 at 11:50:56AM -0700, Yinghai Lu wrote:
    >> Cyrill Gorcunov wrote:
    >> initial apic id and apic id could be different.
    >> and we should use initial apic id to get correct phys pkg id in case BIOS set crazy apic id.
    > Is there a specific bug we are fixing here? Again, this behavior was
    > present from atleast 2.6.15-2.6.30 on 'flat' and older 'cluster' apics, and intel
    > documentation suggests local apic be used. Is there a specific bios bug
    > that is being fixed?
    > (The BIOS is not supposed to set a crazy apic ID. The BIOS is buggy in that

    we can not stop BIOS doing crazy thing.

    for AMD 8 socket 4 cores system. BSP apic id : 4 or 8, and initial apic id is 0:

    with apic id in phys_pkg_id, will get pkg id: 1, 2, ...

    with initial apic id will get pkg id: 0, 1, 2, 3.

    when I was working on LinuxBIOS, I did have one porting to have
    BSP: 0
    AP: start from 5, 6, 7...
    that will have strange in pkg_id.


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      Last update: 2009-08-25 21:39    [W:0.020 / U:30.392 seconds]
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