Subject: Re: Finally increasing vm.execmin by default
To: Matthias Buelow <>
From: Johnny Billquist <bqt@Update.UU.SE>
List: tech-kern
Date: 10/28/2005 17:58:15
On Fri, 28 Oct 2005, Matthias Buelow wrote:

> Todd Vierling wrote:
> > If a system has many GiB of memory, it should be up to the admin to lower
> > the execmin in order to gain yet more fs or anon page cache.  It should
> > *not* be up to the users of systems with modest memory to raise them.
> IMHO it should be the task of the system to autotune itself. I mean, how
> many people know about these knobs, when they don't experience any
> serious problems (but might unknowingly be having suboptimal
> performance)? I didn't, and I have been using NetBSD for years.
> Who _wants_ to fiddle around with obscure sysctl settings, trying to get
> to a kernel parameter configuration that might work substantially
> better? The system should tune itself, we're not in the 70ies anymore.

I think VMS did already tune itself in the 70s... :-)

But I agree with all of the above. It seems very clear to me that the
default are bad, which I've said in the past.

I also agree that some autotuning would really be good. Question is, can
we do that with a reasonable amount of work?


Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email:           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol