Re: 1M hugepage size being registered on Linux

On 06/21/2017 07:33 AM, Michael Ellerman wrote:

quoted

I am working on a bug related to 1M hugepage size being registered on
Linux (Power 8 Baremetal - Garrison).

Wasn't that caused by a firmware bug?

Ben/Stewart, does that ring a bell, something new, intended or not? :- )

Thanks,

quoted

I was checking dmesg and it seems that 1M page size is coming from
firmware to Linux.

[    0.000000] base_shift=20: shift=20, sllp=0x0130, avpnm=0x00000000,
tlbiel=0, penc=2
[    1.528867] HugeTLB registered 1 MB page size, pre-allocated 0 pages

Should Linux support this page size?

Does it work?:)

The user manual says it's a supported size, but I thought it didn't work
(in hardware) for some reason.

-- 
Mauricio Faria de Oliveira
IBM Linux Technology Center