[PC-BSD Dev] vm.pmap.pg_ps_enabled sysctl tunable

QT rdirective at gmail.com
Thu Aug 5 21:55:39 PDT 2010


I believe this knob is already enabled.

Quyen

On Thu, Aug 5, 2010 at 9:14 AM, N V <VaNs9 at yandex.ru> wrote:

> Hello.
>
> There is sysctl vm.pmap.pg_ps_enabled tunable available, controlling:
> "application memory pages are dynamically promoted to or demoted from
> superpages" . It has been introduced in 7.2. It is off by default.
> Official info here: http://www.freebsd.org/releases/7.2R/relnotes.html
> Dev.team:
> http://lists.freebsd.org/pipermail/freebsd-current/2008-August/087605.html
> So, I haven't found any final info, advising where to enable it, and where
> to not. A mean systems, which are advised to use this variable, and which
> are not. There is only a "50-50" about k8-equipped systems.
> I use systems equipped with Pentium D 2.80GHz, Core 2 Duo E4500 and AMD
> Turion 64 TL-60. The vm.pmap.pg_ps_enabled is turned on. I have no problem
> with it. Used both i386/amd64 FreeBSD >=7.2 on them, except Pentium D system
> (there is i386). But, I haven't done any performance tests.
> Since PC-BSD i386 may be used on some old systems, may be it'll be useful
> to turned it on in amd64 version?
>
> Regards,
> Vans.
> _______________________________________________
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> Dev at lists.pcbsd.org
> http://lists.pcbsd.org/mailman/listinfo/dev
>
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