QoS on Cyrus traffic

Henrique de Moraes Holschuh hmh at debian.org
Tue Feb 9 21:14:16 EST 2010

On Sat, 09 Jan 2010, Bron Gondwana wrote:
> On Fri, 08 Jan 2010 15:06 -0500, "Ken Murchison" <murch at andrew.cmu.edu> wrote:
> > Can we get some opinions on the feature request below:
> > 
> > https://bugzilla.andrew.cmu.edu/show_bug.cgi?id=3184
> > 
> > I'm pretty much convinced that such a feature is worth adding, the only 
> > question is where should it be configured: imapd.conf or cyrus.conf ?
> I'd like to chime in with an "imapd.conf please" - it supports per-service alterations
> if you want, but allows for a sane default and global configuration easily.
> The most important thing is the default value, which is what most sites are going to
> be running, so let's make sure we choose a sane default!

IMO, the sane default is to leave it alone by default (i.e. don't do the
setsockopt() call when DSCP is not explicitly configured).

Messing with the DSCP field can have surprising results when the packet
crosses the AS border.  You can get far worse service than you would with

  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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