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    SubjectRe: [PATCH] amd64_edac: Memory size reported double on processor family 0Fh
    On 09/14/2012 07:55 AM, Josh Hunt wrote:
    >
    > Thanks to your help I was able to test your branch, but it still does
    > not resolve the problem. Removal of the "factor=1" workaround fixes the
    > memory size reporting on boot, but the sysfs values are still incorrect.
    >

    Please disregard what I said earlier about the shift still being wrong.
    Looking at the dmesg more I see now that the # of pages are correctly
    reported (262144), however sysfs is still wrong.

    [ 25.837588] EDAC DEBUG: init_csrows: MC node: 0, csrow: 0
    [ 25.837589] EDAC DEBUG: amd64_csrow_nr_pages: csrow: 0, channel: 0,
    DBAM idx: 2
    [ 25.837591] EDAC DEBUG: amd64_csrow_nr_pages: nr_pages/channel: 262144
    [ 25.837592] EDAC amd64: CS0: Unbuffered DDR2 RAM
    [ 25.837724] EDAC DEBUG: init_csrows: Total csrow0 pages: 262144
    [ 25.837725] DBG: init_csrows: channel_count:2
    [ 25.837856] DBG: init_csrows: channel_count:2
    [ 25.837988] EDAC DEBUG: init_csrows: MC node: 0, csrow: 1
    [ 25.837989] EDAC DEBUG: amd64_csrow_nr_pages: csrow: 1, channel: 0,
    DBAM idx: 2
    [ 25.837991] EDAC DEBUG: amd64_csrow_nr_pages: nr_pages/channel: 262144
    [ 25.837992] EDAC amd64: CS1: Unbuffered DDR2 RAM
    [ 25.838157] EDAC DEBUG: init_csrows: Total csrow1 pages: 262144
    [ 25.838158] DBG: init_csrows: channel_count:2
    [ 25.838289] DBG: init_csrows: channel_count:2
    [ 25.838421] EDAC DEBUG: init_csrows: MC node: 0, csrow: 2
    [ 25.838422] EDAC DEBUG: amd64_csrow_nr_pages: csrow: 2, channel: 0,
    DBAM idx: 2
    [ 25.838424] EDAC DEBUG: amd64_csrow_nr_pages: nr_pages/channel: 262144
    [ 25.838425] EDAC amd64: CS2: Unbuffered DDR2 RAM
    [ 25.838556] EDAC DEBUG: init_csrows: Total csrow2 pages: 262144
    [ 25.838558] DBG: init_csrows: channel_count:2
    [ 25.838689] DBG: init_csrows: channel_count:2
    [ 25.838820] EDAC DEBUG: init_csrows: MC node: 0, csrow: 3
    [ 25.838822] EDAC DEBUG: amd64_csrow_nr_pages: csrow: 3, channel: 0,
    DBAM idx: 2
    [ 25.838823] EDAC DEBUG: amd64_csrow_nr_pages: nr_pages/channel: 262144
    [ 25.838824] EDAC amd64: CS3: Unbuffered DDR2 RAM
    [ 25.838957] EDAC DEBUG: init_csrows: Total csrow3 pages: 262144

    I looked into this and see that sysfs is doing the double counting b/c
    it loops over the # of channels:

    [ 131.423949] DBG: csrow_size_show: i:0 nr_pages:262144 nr_channels:2
    [ 131.424112] DBG: csrow_size_show: i:1 nr_pages:524288 nr_channels:2

    I verified this in init_csrows:
    [ 25.838958] DBG: init_csrows: channel_count:2

    Since I don't know the details of the hardware here it's hard for me to
    suggest a fix, but it would seem that k8_early_channel_count() needs to
    be modified to only return 1 in this case?

    Josh





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