[ofa-general] change mtu

[Hal Rosenstock]

On Mon, Aug 17, 2009 at 9:02 AM, Michael Di Domenico <mdidomenico4 at gmail.com
> wrote:

> Yes, I have a group of machines with 8131 and MT23108 cards.
> Supposedly, based on the AMD errata i need to turn the cards MTU down
> from 2048 to below 1500


Then you need to use 1024 or smaller (512 or 256).


>
>
> No i'm not running OpenSM,


And that SM doesn't support cranking the PR MTU down for Tavor communication
?


> i'd prefer to do this at the machine level
> if possible rather then the fabric level.


I think the MTUCap of the .ini file would need to be changed in order to get
the SM to negotiate the link MTU (NeighborMTU) smaller. MTUCap 3 is 1024.

-- Hal


>
>
> On Mon, Aug 17, 2009 at 9:00 AM, Hal Rosenstock<hal.rosenstock at gmail.com>
> wrote:
> >
> >
> > On Mon, Aug 17, 2009 at 8:52 AM, Michael Di Domenico
> > <mdidomenico4 at gmail.com> wrote:
> >>
> >> Yes, for the IB card itself, not IPoIB
> >
> >
> > The MTUCap of the card can affect the NeighborMTU which in turn can
> > affect IPoIB MTU (for UD mode).
> >
> > -- Hal
> >
> >>
> >> On Mon, Aug 17, 2009 at 8:48 AM, Dotan Barak<dotanba at gmail.com> wrote:
> >> > Hi.
> >> >
> >> > Which MTU do you try to change?
> >> > (of the IB link?)
> >> >
> >> > Dotan
> >> >
> >> > On Mon, Aug 17, 2009 at 3:16 PM, Michael Di
> >> > Domenico<mdidomenico4 at gmail.com> wrote:
> >> >> How do I change the MTU of an MT23108 card?  I have an AMD 8131
> >> >> chipset server that needs this turned down below 1500, or atleast
> >> >> that's what's suspected.
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> >
>
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