Skip site navigation (1)Skip section navigation (2)
Date:      Mon, 16 Apr 2018 15:54:23 -0700
From:      Lee Brown <leeb@ratnaling.org>
To:        freebsd-net <freebsd-net@freebsd.org>
Subject:   Re: QOS/TOS in carp/freebsd in general
Message-ID:  <CAFPNf5-wiiF876NuYFwfOVDD53zODQ=fZkk0UdaxLQRXO420UQ@mail.gmail.com>
In-Reply-To: <20180416082736.GB48822@tom-desk.erg.abdn.ac.uk>
References:  <CACxAneCODxbgA3qWDqtt%2B_dOZfEmUrCnw_T8eEovZK8a6c5GtQ@mail.gmail.com> <20180416082736.GB48822@tom-desk.erg.abdn.ac.uk>

next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, Apr 16, 2018 at 1:27 AM, Tom Jones <tom@erg.abdn.ac.uk> wrote:

> On Sun, Apr 15, 2018 at 04:30:45PM -0400, Nick Wolff wrote:
> >  Hi,
> >
> > I currently have a review in to make carp use dscp values on outgoing
> > packets. This will make it easier to preform QOS on modern switches as we
> > have been able to drive carp insane on 10g links while throwing storage
> > traffic at it.On an interesting side note apparently after 64k mac
> address
> > moves for a single mac address in the cam table arista 7050t  seems to
> with
> > out warning give up and stop moving address but leaves it in the table
> > where ever it last was.
> >
> > I was originally going to just toggle between cs7 and the old TOS low
> delay
> > setting. But it was requested that I just make it a settable Integer
> value.
> > In this case I'm planning to do 0-63 to match dscp with a default of 54
> > (CS7) (Network Control) but you could still set the old value by setting
> > the sysctl to 4. Anything larger then 64 would be truncated as two shifts
> > are needed to align with the field leading.
> >
> > Does anybody do anything anywhere with the old TOS values like low delay
> in
> > there networking infrastructure? Should this be updated in other places
> in
> > kernel and userland? It's been 20 years since TOS was deprecated and
> > replaced with DSCP.
> >
> > Any other comments or thought are always welcome.
>
> You can already do this with ipfw?

setdscp cs7 from me to 224.0.0.18



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAFPNf5-wiiF876NuYFwfOVDD53zODQ=fZkk0UdaxLQRXO420UQ>