Re: slow boot with 7fef431be9c9 ("mm/page_alloc: place pages to tail in __free_pages_core()")

[David Hildenbrand <david@redhat.com>]

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