documentation on sysctl vm.defer_swapspace_pageouts?

Bill Moran wmoran at
Sat May 29 06:50:28 PDT 2004

Geert Hendrickx wrote:
> Hi, 
> where can I find documentation on the vm.defer_swapspace_pageouts
> sysctl?  LINT only mentions it, without explaining, man sysctl doesn't 
> mention it at all, and even Google yields very few useful results...  

All I found in the source was this:
"Give preference to dirty pages in mem"
in src/sys/vm/vm_pageout.c, this is the description available from
sysctl -d

> I was looking for a way to tune swap-usage a bit, I heard Linux has a
> "swappiness" setting (telling the kernel how easy it should go with 
> paging out), and I hoped FreeBSD would have something similar.
> vm.defer_swapspace_pageouts might do the trick, but so it seems to be 
> poorly documented...  

Seems so.  This might be a question better suited for hackers@ ... and
then passed on to doc@ ... I believe there's an effort currently going
on to document all sysctls ...

Bill Moran
Potential Technologies

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