"swap" partition leads to instability?

RW rwmaillists at googlemail.com
Wed May 29 12:50:31 UTC 2013

On Wed, 29 May 2013 13:57:22 +0200
Fred Morcos wrote:

> Linux has a sysctl variable vm.swappiness which you can set to 0 or 1
> out of 100. Not sure how to achieve the same on FreeBSD, maybe one or
> more combinations of the following?

You'll probably make things worse.

> vm.stats.vm.v_swappgsout: 236969
> vm.stats.vm.v_swappgsin: 28411
> vm.stats.vm.v_swapout: 92607
> vm.stats.vm.v_swapin: 28285

These are just information

> vm.disable_swapspace_pageouts: 0

I'm not entirely sure, but I think this just disables paging at
runtime - rather than compile time. 

> vm.defer_swapspace_pageouts: 0

IIRC this defers paging, but it can end up with the paging done on the
critical path rather in the background - it's usually a bad idea.

> vm.swap_idle_enabled: 0
> vm.swap_idle_threshold2: 10
> vm.swap_idle_threshold1: 2

This why you shouldn't confuse swapping and paging. These are about
actually swapping-out processes. It's mainly about reducing memory use
on multiuser systems where there many terminal idle at at any time. 

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