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hugepages support [message #53500] Sun, 21 April 2019 08:10 Go to next message
mangelot is currently offline  mangelot
Messages: 14
Registered: January 2012
Junior Member
From: *adsl-surfen.hetnet.nl
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
Re: hugepages support [message #53501 is a reply to message #53500] Mon, 22 April 2019 13:03 Go to previous messageGo to next message
khorenko is currently offline  khorenko
Messages: 512
Registered: January 2006
Location: Moscow, Russia
Senior Member
From: *virtuozzo.com
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 you problem is solved - please, report it!
It's even more important than reporting the problem itself...
Re: hugepages support [message #53502 is a reply to message #53501] Tue, 23 April 2019 07:29 Go to previous messageGo to next message
mangelot is currently offline  mangelot
Messages: 14
Registered: January 2012
Junior Member
From: *adsl-surfen.hetnet.nl
and how about the older openvz?

www.mangelot-hosting.nl
Re: hugepages support [message #53505 is a reply to message #53502] Tue, 23 April 2019 09:06 Go to previous message
khorenko is currently offline  khorenko
Messages: 512
Registered: January 2006
Location: Moscow, Russia
Senior Member
From: *virtuozzo.com
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 you problem is solved - please, report it!
It's even more important than reporting the problem itself...
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