On Tue, Sep 9, 2008 at 9:07 AM, Marty Schlining <[EMAIL PROTECTED]> wrote: > With OFED 1.3.1 or 1.4, is it possible to force the link speed of a DDR HCA > port or the entire DDR HCA from a DDR link to strictly SDR? If so, how can > it be done? The HCAs in question is a Mellanox MT25208 dual port HCA, rev > A3, firmware 4.8.2.
Yes. For an individual port, look at the infiniband-diags ibportstate command included in management: ibportstate speed There are ramifications on the SM to use this in that it must not overwrite the speed (PortInfo:LinkSpeedEnabled). OpenSM has a force_link_speed option for this which can be set to 0 for this type of operation. You will also need to reset the port to make it take effect as renegotiation does not occur unless this is done. ibportstate reset The reset is only allowed on switch port so the peer port must be found. If you want all ports to be SDR and are using OpenSM, you can just set force_link_speed to SDR (1). -- Hal > > Martin Schlining > > [EMAIL PROTECTED] > > _______________________________________________ > general mailing list > [email protected] > http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general > > To unsubscribe, please visit > http://openib.org/mailman/listinfo/openib-general > _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
