linux-kernel - RE: slow boot with 7fef431be9c9 ("mm/page_alloc: place pages to tail in __free_pages

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Message-ID: <MW3PR12MB4537B6D5911092E456220818F36B9@MW3PR12MB4537.namprd12.prod.outlook.com>
Date:   Tue, 16 Mar 2021 08:58:35 +0000
From:   "Liang, Liang (Leo)" <Liang.Liang@....com>
To:     David Hildenbrand <david@...hat.com>,
        Mike Rapoport <rppt@...ux.ibm.com>
CC:     "Deucher, Alexander" <Alexander.Deucher@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Huang, Ray" <Ray.Huang@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        George Kennedy <george.kennedy@...cle.com>
Subject: RE: slow boot with 7fef431be9c9 ("mm/page_alloc: place pages to tail
 in __free_pages_core()")

[AMD Public Use]

Hi David,

root@...u-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@...hat.com> 
Sent: Tuesday, March 16, 2021 4:54 PM
To: Liang, Liang (Leo) <Liang.Liang@....com>; Mike Rapoport <rppt@...ux.ibm.com>
Cc: Deucher, Alexander <Alexander.Deucher@....com>; linux-kernel@...r.kernel.org; amd-gfx list <amd-gfx@...ts.freedesktop.org>; Andrew Morton <akpm@...ux-foundation.org>; Huang, Ray <Ray.Huang@....com>; Koenig, Christian <Christian.Koenig@....com>; Rafael J. Wysocki <rafael@...nel.org>; George Kennedy <george.kennedy@...cle.com>
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