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

[Hal Rosenstock]

On Tue, 2008-02-19 at 13:17 -0500, Chuck Hartley wrote:
> Hmmm, I don't have an opensm.opts file on my system.

I don't use openm.conf so don't know what it can and cannot do.

>   Does it go in /var/cache/osm?

Which OpenSM/OFED version are you using ?

>  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?

You can generate it via opensm -c and then edit the file produced.

I'm not sure about the how opensm.conf will work with a cache file
(precedence of settings, etc.).

> 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

sm priority can be changed on the opensm command line.

-- Hal

> 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
>         >
>