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    SubjectRE: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with 2.6.29-rc3 on IBM x3400
    Date
    Hi,

    > so that bios need to be fixed too.

    a small update:
    IBM said the BIOS-provided physical RAM map should be okay and they will not
    release a new bios... IBM said, this is a linux problem triggered through
    arch/x86/kernel/cpu/mtrr/...

    After installing and testing ubuntu server 9.04 (linux 2.6.28) i get this
    warning/failure in dmesg:

    [ 0.000000] BIOS EBDA/lowmem at: 0009c400/0009c400
    [ 0.000000] Initializing cgroup subsys cpuset
    [ 0.000000] Initializing cgroup subsys cpu
    [ 0.000000] Linux version 2.6.28-11-server (buildd@crested) (gcc version
    4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #37-Ubuntu SMP Mon Mar 23 17:33:24 UTC 2009
    (Ubuntu 2.6.28-11.37-server)
    [ 0.000000] Command line: root=/dev/mapper/ubuntu--server-root ro quiet
    splash
    [ 0.000000] KERNEL supported cpus:
    [ 0.000000] Intel GenuineIntel
    [ 0.000000] AMD AuthenticAMD
    [ 0.000000] Centaur CentaurHauls
    [ 0.000000] BIOS-provided physical RAM map:
    [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009c400 (usable)
    [ 0.000000] BIOS-e820: 000000000009c400 - 00000000000a0000 (reserved)
    [ 0.000000] BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
    [ 0.000000] BIOS-e820: 0000000000100000 - 00000000bff60000 (usable)
    [ 0.000000] BIOS-e820: 00000000bff60000 - 00000000bff6a000 (ACPI data)
    [ 0.000000] BIOS-e820: 00000000bff6a000 - 00000000bff80000 (ACPI NVS)
    [ 0.000000] BIOS-e820: 00000000bff80000 - 00000000c0000000 (reserved)
    [ 0.000000] BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
    [ 0.000000] BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
    [ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
    [ 0.000000] BIOS-e820: 00000000ff000000 - 0000000100000000 (reserved)
    [ 0.000000] BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
    [ 0.000000] DMI present.
    [ 0.000000] last_pfn = 0x140000 max_arch_pfn = 0x3ffffffff
    [ 0.000000] ------------[ cut here ]------------
    [ 0.000000] WARNING: at
    /build/buildd/linux-2.6.28/arch/x86/kernel/cpu/mtrr/generic.c:411
    generic_get_mtrr+0xfa/0x130()
    [ 0.000000] mtrr: your BIOS has set up an incorrect mask, fixing it up.
    [ 0.000000] Modules linked in:
    [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.28-11-server #37-Ubuntu
    [ 0.000000] Call Trace:
    [ 0.000000] [<ffffffff80250927>] warn_slowpath+0xb7/0xf0
    [ 0.000000] [<ffffffff8041ea88>] ? sprintf+0x68/0x70
    [ 0.000000] [<ffffffff8041e5d8>] ? vsnprintf+0x2e8/0x730
    [ 0.000000] [<ffffffff8069eaf8>] ? _spin_unlock_irqrestore+0x18/0x20
    [ 0.000000] [<ffffffff8069eaf8>] ? _spin_unlock_irqrestore+0x18/0x20
    [ 0.000000] [<ffffffff8025124d>] ? release_console_sem+0x1dd/0x230
    [ 0.000000] [<ffffffff8025172c>] ? vprintk+0x19c/0x400
    [ 0.000000] [<ffffffff80a1aa16>] ? dmi_save_one_device+0x79/0xb4
    [ 0.000000] [<ffffffff80220c6a>] generic_get_mtrr+0xfa/0x130
    [ 0.000000] [<ffffffff809f7215>] mtrr_trim_uncached_memory+0xa3/0x331
    [ 0.000000] [<ffffffff809f26c4>] setup_arch+0x5c6/0x902
    [ 0.000000] [<ffffffff80273822>] ?
    clockevents_register_notifier+0x42/0x60
    [ 0.000000] [<ffffffff809e9b33>] start_kernel+0x6e/0x3b2
    [ 0.000000] [<ffffffff809e92b4>] x86_64_start_reservations+0x94/0xb9
    [ 0.000000] [<ffffffff809e93ee>] x86_64_start_kernel+0xf2/0x101
    [ 0.000000] [<ffffffff809e9140>] ? early_idt_handler+0x0/0x71
    [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---
    [ 0.000000] last_pfn = 0xbff60 max_arch_pfn = 0x3ffffffff
    [ 0.000000] Scanning 2 areas for low memory corruption
    [ 0.000000] modified physical RAM map:
    [ 0.000000] modified: 0000000000000000 - 0000000000001000 (usable)
    [ 0.000000] modified: 0000000000001000 - 0000000000006000 (reserved)
    [ 0.000000] modified: 0000000000006000 - 0000000000008000 (usable)
    [ 0.000000] modified: 0000000000008000 - 0000000000010000 (reserved)
    [ 0.000000] modified: 0000000000010000 - 000000000008f400 (usable)
    [ 0.000000] modified: 000000000009c400 - 00000000000a0000 (reserved)
    [ 0.000000] modified: 00000000000e0000 - 0000000000100000 (reserved)
    [ 0.000000] modified: 0000000000100000 - 00000000bff60000 (usable)
    [ 0.000000] modified: 00000000bff60000 - 00000000bff6a000 (ACPI data)
    [ 0.000000] modified: 00000000bff6a000 - 00000000bff80000 (ACPI NVS)
    [ 0.000000] modified: 00000000bff80000 - 00000000c0000000 (reserved)
    [ 0.000000] modified: 00000000e0000000 - 00000000f0000000 (reserved)
    [ 0.000000] modified: 00000000fec00000 - 00000000fec10000 (reserved)
    [ 0.000000] modified: 00000000fee00000 - 00000000fee01000 (reserved)
    [ 0.000000] modified: 00000000ff000000 - 0000000100000000 (reserved)
    [ 0.000000] modified: 0000000100000000 - 0000000140000000 (usable)
    [ 0.000000] init_memory_mapping: 0000000000000000-00000000bff60000
    [ 0.000000] 0000000000 - 00bfe00000 page 2M
    [ 0.000000] 00bfe00000 - 00bff60000 page 4k
    [ 0.000000] kernel direct mapping tables up to bff60000 @ 10000-15000
    [ 0.000000] last_map_addr: bff60000 end: bff60000
    [ 0.000000] init_memory_mapping: 0000000100000000-0000000140000000
    [ 0.000000] 0100000000 - 0140000000 page 2M
    [ 0.000000] kernel direct mapping tables up to 140000000 @ 13000-19000
    [ 0.000000] last_map_addr: 140000000 end: 140000000

    root@ubuntu-server:/# uname -a
    Linux ubuntu-server 2.6.28-11-server #37-Ubuntu SMP Mon Mar 23 17:33:24 UTC
    2009 x86_64 GNU/Linux

    root@ubuntu-server:/# cat /proc/mtrr
    reg00: base=0x0c0000000 ( 3072MB), size= 1024MB, count=1: uncachable
    reg01: base=0x000000000 ( 0MB), size= 4096MB, count=1: write-back
    reg02: base=0x100000000 ( 4096MB), size= 1024MB, count=1: write-back
    reg03: base=0x0bff80000 ( 3071MB), size= 512KB, count=1: uncachable

    Morten

    -----Original Message-----
    From: Yinghai Lu [mailto:yinghai@kernel.org]
    Sent: Wednesday, February 11, 2009 7:52 PM
    To: Morten P.D. Stevens
    Cc: Ingo Molnar; Thomas Gleixner; H. Peter Anvin; Arjan van de Ven;
    linux-kernel@vger.kernel.org
    Subject: Re: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with
    2.6.29-rc3 on IBM x3400

    Morten P.D. Stevens wrote:
    > Hi,
    >
    >> so there is some problem with your BIOS, please ask the vendor to
    >> provide one to make
    >> 2.6.24 happy.
    >
    > I'll report the issue to the IBM support.
    >
    > on our IBM x3400 servers running RHEL the same output:
    >
    > 2.6.18-92.1.10.el5 #
    >
    > reg00: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1
    > reg01: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1
    > reg02: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
    > reg03: base=0xbff80000 (3071MB), size=196608MB: uncachable, count=1

    so that bios need to be fixed too.

    >
    > and in dmesg:
    >
    > mtrr: type mismatch for d0000000,1000000 old: uncachable new:
    > write-combining
    want add one entry for xwindow with your display card.
    >
    >
    > Is this a big problem for direct usage? The performance on these servers
    > is still fine...?
    x window could be some slow.

    YH



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