From: Wietse Venema (no email)
Date: Mon Sep 03 2007 - 14:20:25 EDT
Leandro Santi:
> On 9/3/07, Wietse Venema <> wrote:
> > > It may be a shame if the stress flag oscilates on and off all day...
> > > How do we detect that it needs to be on for a prolonged time, and how
> > > do we detect that it is appropriate to turn it off?
> >
> > Initially, a simple form of pulse stretching (don't change the
> > stress level until the load has dropped for some 15 minutes).
> > High-low watermark solutions alone are too jittery, and moreover
> > they are too complex for legacy Postfix releases.
>
> I'm reluctant to automate decisions based on the
> system's load average, because the measure is not
> regular across multiple kernel vendors (or different
> Linux versions :-), nor it is fair across multiple
> hardware configurations.
I am talking about Postfix's own load measurement.
> IIRC, older Sendmail used to do this, albeit with
> a totally different program architecture, and with
> different purpose: reject new connections when the
> load average exceeded a limit. Never worked for me.
I implemented Postfix's own load measurement because
Sendmail's approach had shortcomings.
Wietse
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