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hugepages support [message #53500]

Sun, 21 April 2019 08:10

mangelot
Messages: 14
Registered: January 2012

Junior Member

Hello,

Just a quick question is Hugepages support still disabled by default in openvz kernel.
is it safe to enable it?

www.mangelot-hosting.nl

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Re: hugepages support [message #53501 is a reply to message #53500]

Mon, 22 April 2019 13:03

khorenko
Messages: 533
Registered: January 2006
Location: Moscow, Russia

Senior Member

Hi,

in OpenVZ 7 transparent hugepages are enabled by default.

(root@vz7)/sys:cat ./kernel/mm/transparent_hugepage/enabled
[always] madvise never
(root@vz7)/sys:uname -a
Linux <hostname> 3.10.0-957.10.1.vz7.85.16 #1 SMP Tue Apr 9 15:57:50 MSK 2019 x86_64 x86_64 x86_64 GNU/Linux

kernel config:
CONFIG_TRANSPARENT_HUGEPAGE=y
CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y

If your problem is solved - please, report it!
It's even more important than reporting the problem itself...

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Re: hugepages support [message #53502 is a reply to message #53501]

Tue, 23 April 2019 07:29

mangelot
Messages: 14
Registered: January 2012

Junior Member

and how about the older openvz?

www.mangelot-hosting.nl

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Re: hugepages support [message #53505 is a reply to message #53502]

Tue, 23 April 2019 09:06

khorenko
Messages: 533
Registered: January 2006
Location: Moscow, Russia

Senior Member

mangelot wrote on Tue, 23 April 2019 10:29

and how about the older openvz?

[root@day sys]# cat ./kernel/mm/transparent_hugepage/enabled
always madvise [never]
[root@day sys]# uname -a
Linux <hostname> 2.6.32-042stab134.8 #1 SMP Fri Dec 7 17:16:09 MSK 2018 x86_64 x86_64 x86_64 GNU/Linux

So, the things remain the same.
AFAIK, you can enable them and node should not crash instantly after that. Smile

But as it's not a default configuration, it's not that widely tested by number of installations.

If i were you and i need hugepages for some reason, i'd upgrade to OpenVZ 7 -
you've got a good reason now. Smile

If your problem is solved - please, report it!
It's even more important than reporting the problem itself...

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