[AMD Public Use]
Hi David,
root@scbu-Chachani:~# cat /proc/mtrr
reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back
reg01: base=0x0ffe00000 ( 4094MB), size= 2MB, count=1: write-protect
reg02: base=0x100000000 ( 4096MB), size= 16MB, count=1: write-protect
reg03: base=0x0ffde0000 ( 4093MB), size= 128KB, count=1: write-protect
reg04: base=0x0ff000000 ( 4080MB), size= 512KB, count=1: write-protect
BRs,
Leo
-----Original Message-----
From: David Hildenbrand <david@xxxxxxxxxx>
Sent: Tuesday, March 16, 2021 4:54 PM
To: Liang, Liang (Leo) <Liang.Liang@xxxxxxx>; Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Deucher, Alexander <Alexander.Deucher@xxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx; amd-gfx list <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>; Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>; Huang, Ray <Ray.Huang@xxxxxxx>; Koenig, Christian <Christian.Koenig@xxxxxxx>; Rafael J. Wysocki <rafael@xxxxxxxxxx>; George Kennedy <george.kennedy@xxxxxxxxxx>
Subject: Re: slow boot with 7fef431be9c9 ("mm/page_alloc: place pages to tail in __free_pages_core()")
On 16.03.21 09:43, Liang, Liang (Leo) wrote:
> [AMD Public Use]
>
> Hi David,
>
> Thanks for your explanation. We saw slow boot issue on our farm/QA's machines and mine. All of machines are same SoC/board.
I cannot spot anything really special in the logs -- it's just ordinary system ram -- except:
[ 0.000027] MTRR fixed ranges enabled:
[ 0.000028] 00000-9FFFF write-back
[ 0.000029] A0000-BFFFF uncachable
[ 0.000030] C0000-FFFFF write-through
[ 0.000031] MTRR variable ranges enabled:
[ 0.000032] 0 base 000000000000 mask FFFF80000000 write-back
[ 0.000034] 1 base 0000FFE00000 mask FFFFFFE00000 write-protect
[ 0.000035] 2 base 000100000000 mask FFFFFF000000 write-protect
[ 0.000036] 3 base 0000FFDE0000 mask FFFFFFFE0000 write-protect
[ 0.000038] 4 base 0000FF000000 mask FFFFFFF80000 write-protect
[ 0.000039] 5 disabled
[ 0.000039] 6 disabled
[ 0.000040] 7 disabled
Not sure if "2 base 000100000000" indicates something nasty. Not sure how to interpret the masks.
Can you provide the output of "cat /proc/mtrr" ?
--
Thanks,
David / dhildenb
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