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    SubjectRe: [Bug 11388] New: 2.6.27-rc3 warns about MTRR range; only 3 of 16gb of memory is usable
    On Wed, Aug 20, 2008 at 6:04 PM, Andrew Morton
    <akpm@linux-foundation.org> wrote:
    >
    > (switched to email. Please respond via emailed reply-to-all, not via the
    > bugzilla web interface).
    >
    > On Wed, 20 Aug 2008 17:38:59 -0700 (PDT)
    > bugme-daemon@bugzilla.kernel.org wrote:
    >
    >> http://bugzilla.kernel.org/show_bug.cgi?id=11388
    >>
    >> Summary: 2.6.27-rc3 warns about MTRR range; only 3 of 16gb of
    >> memory is usable
    >> Product: Memory Management
    >> Version: 2.5
    >> KernelVersion: 2.6.27-rc3
    >> Platform: All
    >> OS/Version: Linux
    >> Tree: Mainline
    >> Status: NEW
    >> Severity: normal
    >> Priority: P1
    >> Component: MTTR
    >> AssignedTo: akpm@osdl.org
    >> ReportedBy: j_kernel@hoblitt.com
    >>
    >>
    >> Latest working kernel version: 2.4.24.2 (possibly later)
    >> Earliest failing kernel version: 2.6.27-rc3-21328-ga7f5aaf (from netdev-2.6)
    >> Distribution: Gentoo
    >> Hardware Environment: 2x Intel X5482
    >> Software Environment:
    >> Problem Description:
    >>
    >> [ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing
    >> 13056MB of RAM.
    >> [ 0.000000] ------------[ cut here ]------------
    >> [ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1561
    >> mtrr_trim_uncached_memory+0x508/0x550()
    >> [ 0.000000] Modules linked in:
    >> [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.27-rc3-21328-ga7f5aaf #8
    >> [ 0.000000]
    >> [ 0.000000] Call Trace:
    >> [ 0.000000] [<ffffffff80234c3e>] warn_on_slowpath+0x51/0x77
    >> [ 0.000000] [<ffffffff8023570a>] printk+0x4e/0x56
    >> [ 0.000000] [<ffffffff803add02>] sort+0xfa/0x18c
    >> [ 0.000000] [<ffffffff808283d3>] cmp_range+0x0/0x6
    >> [ 0.000000] [<ffffffff80828a47>] mtrr_trim_uncached_memory+0x508/0x550
    >> [ 0.000000] [<ffffffff802178e1>] post_set+0x20/0x3d
    >> [ 0.000000] [<ffffffff80824f99>] setup_arch+0x39d/0x6be
    >> [ 0.000000] [<ffffffff8081e962>] start_kernel+0x74/0x341
    >> [ 0.000000] [<ffffffff8081e394>] x86_64_start_kernel+0xe3/0xe7
    >> [ 0.000000]
    >> [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---
    >>
    >>
    >> Steps to reproduce:
    >>
    >> This warning isn't present under 2.6.24.2 and the full range of physical memory
    >> is usable.
    >
    > Looks like a post-2.6.26 regression caused by
    > 12031a624af7816ec7660b82be648aa3703b4ebe.
    reg00: base=0xd0000000 (3328MB), size=196864MB: uncachable, count=1
    reg01: base=0xe0000000 (3584MB), size=197120MB: uncachable, count=1
    reg02: base=0x00000000 ( 0MB), size=212992MB: write-back, count=1
    reg03: base=0x400000000 (16384MB), size=197120MB: write-back, count=1
    reg04: base=0x420000000 (16896MB), size=196864MB: write-back, count=1

    the size mtrr looks crazy.

    YH


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