***SPAM*** Re: [ofa-general] Re: [PATCH] opensm: preserve base lid routes

[Olga Shern (Voltaire)]

On 6/12/08, Hal Rosenstock <hrosenstock at xsigo.com> wrote:
>
> On Tue, 2008-06-10 at 05:59 +0300, Sasha Khapyorsky wrote:
> > Basically this addresses the problem described by Al Chu in:
> >
> > http://lists.openfabrics.org/pipermail/general/2008-April/049132.html
> >
> > When base lid paths become completely disbalanced on a fabrics with
> > lmc > 0.
> >
> > One feedback was from Yiftah Shahar:
> >
> > "I think that our requirements should be that even when you are working
> > with LMC>0 then the base LID routing should not be affected.
>
> > One way to achieve this goal is to first run the base-LID routing (so
> > all base LID improvement will be also in LMC>0) and then start with the
> > other LIDs as round-robbing starting from the base-lid-port + 1
> > according current routing algorithm rules (keeping min-hop, up/down...)."
> >
> > We had some discussion with Al and Yiftah about this and considered that
> > in addition to "pure" base lid paths preservation (which is good thing by
> > itself) proposed method solves original lid disbalancing problem as well.
>
> Would you elaborate on the motivation behind the requirement to
> maintain/preserve the base LID routing ?
>
> -- Hal


LMC > 0 is mainly used by MPI, all other protocols / applications will use
only one LID (PATH),  therefore we should make sure that performance of
these protocols / applications will not be effected if fabric is configured
with LMC > 0

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