On Sun, 13 Mar 2016 16:41:17 +0100
Fabian Keil <freebsd-lis...@fabiankeil.de> wrote:
> Gary Jennejohn <gljennj...@gmail.com> wrote:
> > In the course of the last year or so the behavior of the vm system
> > has changed in regard to how aggressively Inact memory is recycled.
> > My box has 8GB of memory. At the moment I'm copying 100s of gigabytes
> > from one file system to another one.
> > Looking at top I observe that there are about 6GB of Inact memory.
> > This value hardly changes. Instead of aggressively recycling the
> > Inact memory the vm now seems to prefer to swap.
> Are you using ZFS?
No, only UFS, so it's not due to pressure caused by ZFS.
> > Last year, can't rmember excatly when, the behavior was totally
> > different. The vm very aggessively recycled Inact memory and,
> > even when copying 100s of GB of files, the system hardly swapped.
> > It seems rather strange to me that the vm happily allows gigbytes
> > of Inact memory to be present and prefers swapping to recyclincg.
> > Are there any sysctl's I can set to get the old behavior back?
> I don't think so.
> I'm currently using this patch set to work around the issue:
> Patch 4 adds a couple of sysctls that can be used to let the ZFS
> ARC indirectly put pressure on the inactive memory until a given
> target is reached.
Thanks, I'll take a closer look at it.
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