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

From: Morten P.D. Stevens
Date: Sun Mar 29 2009 - 12:03:34 EST

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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@xxxxxxxxxx]
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@xxxxxxxxxxxxxxx
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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Next message: Arjan van de Ven: "Re: fastboot/async and initramfs: How am I supposed to know whendevices are finished initializing?"
Previous message: Thomas Bächler: "fastboot/async and initramfs: How am I supposed to know when devicesare finished initializing?"
Next in thread: Yinghai Lu: "Re: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with 2.6.29-rc3on IBM x3400"
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