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VZ7 DCACHESIZE parameter is deprecated [message #53016] Mon, 23 October 2017 09:56 Go to next message
hansi.klose is currently offline  hansi.klose
Messages: 2
Registered: August 2014
Junior Member
From: *

we are running Virtuozzo 7 (3.10.0-514.26.1.vz7.33.22) in our environment.

In the past we set the DCACHESIZE in OpenVZ 6 to
limit the usage of the dentry/inode cache.

We did this because we had some issues with growing
dcaches causing OOM's on the machine.

In Virtuozzo we see that the dcache is growing again
but we are not able to limit it because there ist no option
in vzctl or prlctl any more.

How can i limit the dcachesize again?

Regards Hans
Re: VZ7 DCACHESIZE parameter is deprecated [message #53120 is a reply to message #53016] Fri, 12 January 2018 08:48 Go to previous message
khorenko is currently offline  khorenko
Messages: 525
Registered: January 2006
Location: Moscow, Russia
Senior Member
From: *
Hi Hans,

kernel memory management must handle caches properly - both pagecache and dcache,
it became much smarter in VZ7 so we do not expect problems now.

All free RAM should be used for caches - pagecache/dcache and kernel must balance them correctly.

If you see any problems on a VZ7 and highly suspect it's due to incorrect dcache size management, please file a bug, we'll investigate it.

Since Virtuozzo 7 RRTM we had a single issue with dcache incorrect shrinking and no known issues at the moment.

Hope that helps.

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