reading kernel tunables from userland ?

[Dan Nelson]

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 at 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 at allantgroup.com