[pve-devel] disabling transparent hugepage by default like kernel 2.6.32 ?
aderumier at odiso.com
Wed Sep 9 17:41:15 CEST 2015
>>Do you really want 'never'? I thought 'madvise' would be better, because we can
>>for some application (KVM)?
AFAIK, even jemalloc for example are not perfect with madvise , they are still latency impact.
They are a lot of bug report with transparent hudgepage with software like redis,varnish,mongodb,mysql,hadoop,oracle, event with madvise.
So I think it's better to setup to safe default value, "never".
User can still enable it after with "echo madvise|always > /sys/kernel/mm/transparent_hugepage/enabled"
----- Mail original -----
De: "dietmar" <dietmar at proxmox.com>
À: "aderumier" <aderumier at odiso.com>
Cc: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mercredi 9 Septembre 2015 16:34:32
Objet: Re: [pve-devel] disabling transparent hugepage by default like kernel 2.6.32 ?
> >>I could set it in kernel config, for example:
> >>would that help?
> Well, this is like "echo madvise >
> But I don't see how to set never.
Do you really want 'never'? I thought 'madvise' would be better, because we can
for some application (KVM)?
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