[ofa-general] Performance of UDAPL RDMA vs IB verbs

[Chuck Hartley]

Hmmm, I don't have an opensm.opts file on my system.  Does it go in
/var/cache/osm? The man page mentions it and that it contains a "complete
set" of configuration options.  Since I don't have one, is it only needed if
you want to change some default setting(s)? Is there an example file
somewhere in the distribution?

>From the output of sminfo, it looks like the default priority is 1, so I
probably want to change that.  But at least it is the master:

sminfo: sm lid 15 sm guid 0x5ad0000094076, activity count 1359786 priority 1
state 3 SMINFO_MASTER


On Feb 19, 2008 12:26 PM, Hal Rosenstock <hrosenstock at xsigo.com> wrote:

> On Mon, 2008-02-18 at 10:19 -0500, Chuck Hartley wrote:
> > I didn't see anything in the opensm.conf file that indicates that
> > OpenSM has a concept of priority.  Is there some way to force it to
> > always be the master?
>
> In opensm.opts,
> #
> # HANDOVER - MULTIPLE SMs OPTIONS
> #
> # SM priority used for deciding who is the master
> sm_priority 15
>
> 15 is the highest priority
>
> Again, it's not advisable to mix SM flavors on the same subnet.
>
> > Is there some advantage or disadvantage to running multiple copies of
> > OpenSM on the subnet?
>
> This provides some redundancy in the case that either the master SM or
> something in the node dies such that the SM is not working.
>
> >    If you have multiple switches connected as we do, should some of
> > the default settings on opensm.conf be changed? In particular, should
> > REASSIGN_LIDS be set to "yes"?
>
> I wouldn't reassign LIDs unless you have a specific reason to. Changing
> LIDs is disruptive.
>
> -- Hal
>
> > Chuck
> >
>
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