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Date:      Fri, 9 May 2008 18:02:32 +0300
From:      Kostik Belousov <kostikbel@gmail.com>
To:        Pawel Jakub Dawidek <pjd@freebsd.org>, rdivacky@freebsd.org
Cc:        cvs-src@freebsd.org, src-committers@freebsd.org, Oliver Fromme <olli@fromme.com>, cvs-all@freebsd.org
Subject:   Re: cvs commit: src/sys/kern subr_param.c
Message-ID:  <20080509150231.GI18958@deviant.kiev.zoral.com.ua>
In-Reply-To: <20080509095911.GE2480@garage.freebsd.pl>
References:  <20080509091228.GC2480@garage.freebsd.pl> <200805090956.m499uEvT007906@haluter.fromme.com> <20080509095911.GE2480@garage.freebsd.pl>

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On Fri, May 09, 2008 at 11:59:11AM +0200, Pawel Jakub Dawidek wrote:
> On Fri, May 09, 2008 at 11:56:14AM +0200, Oliver Fromme wrote:
> >=20
> > Pawel Jakub Dawidek wrote:
> >  > On Fri, May 09, 2008 at 11:08:20AM +0200, Oliver Fromme wrote:
> >  > > Pawel Jakub Dawidek wrote:
> >  > >  >   Modified files:
> >  > >  >     sys/kern             subr_param.c=3D20
> >  > >  >   Log:
> >  > >  >   - Export HZ value via kern.hz sysctl (this is the same name a=
s for the
> >  > >  >     loader tunable).
> >  > >=20
> >  > > It's probably just me, but I don't see the usefulness of
> >  > > this.  The HZ value is already exported via kern.clockrate.
> >  > > (I'm not saying the change is wrong, I'm just looking for
> >  > > an explanation.)
> >  >=20
> >  > The reason for this change was that I was trying to recall what is
> >  > the name of the tunable and I wasn't able to find it with simple
> >  > "sysctl -a | grep hz". In an ideal world most of not all loader
> >  > tunables should also be visible as read-only sysctls.
> >=20
> > Hm.  It was my understanding that the loader tunables
> > are already exported via kenv(2), so typing "kenv"
> > should include them all.  I was probably wrong, though.
>=20
> Only the one that are set (eg. by hints or by you in loader.conf).
> kenv(1) doesn't list all the tunables.

Meantime, all of the *siz ought to be writable sysctls. Roman Divacky had
the patches, I think they finally shall be committed.

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