Date: Wed, 23 Apr 2008 10:39:18 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: pluknet <pluknet@gmail.com>, current@freebsd.org Subject: Re: reading kernel tunables from userland ? Message-ID: <20080423153918.GC99910@dan.emsphone.com> In-Reply-To: <20080423115006.GA37818@onelab2.iet.unipi.it> References: <20080423100759.GA37110@onelab2.iet.unipi.it> <a31046fc0804230314y473a6423g242e637286794449@mail.gmail.com> <20080423115006.GA37818@onelab2.iet.unipi.it>
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In the last episode (Apr 23), Luigi Rizzo said:
> On Wed, Apr 23, 2008 at 02:14:02PM +0400, pluknet wrote:
> > 2008/4/23 Luigi Rizzo <rizzo@iet.unipi.it>:
> > > sorry for the possibly naive question, but is there a way other
> > > than sysctl to read the value of kernel 'tunable' variables ?
> > >
> > > E.g. in if_nfe.c i see
> > >
> > > TUNABLE_INT("hw.nfe.msi_disable", &msi_disable);
> > > TUNABLE_INT("hw.nfe.msix_disable", &msix_disable);
> > > TUNABLE_INT("hw.nfe.jumbo_disable", &jumbo_disable);
> > >
> > > but sysctl is reporting none of them.
> > >
> > > I seem to remember that there was a separate command to access
> > > kernel tunables, but cannot remember which one, and neither 'man
> > > -k tunable' nor a google search return any useful answer...
> >
> > Perhaps are you about kenv ?
>
> yes, thanks...
Is there any reason to have TUNABLE_* macros anymore? A SYSCTL_* macro
with the CTLFLAG_TUN flag does the same thing and also provides sysctl
access.
--
Dan Nelson
dnelson@allantgroup.com
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