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>
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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
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