[ofa-general] Intermittent: ib0: multicast join failed

[Roger Spellman]

Thanks, Hal.  

Below is the output to ibstat and ibstatus.  It shows that the rate is
2.5 Gb/sec, rather than 10 Gb/sec.  

Is there a way to get it to renegotiate the rate, short of rebooting?

[root at ts-raid6-03 lib64]# ibstat
CA 'mthca0'
        CA type: MT25204
        Number of ports: 1
        Firmware version: 1.2.936
        Hardware version: a0
        Node GUID: 0x0002c9020026e4c0
        System image GUID: 0x0002c9020026e4c3
        Port 1:
                State: Active
                Physical state: LinkUp
                Rate: 2
                Base lid: 19
                LMC: 0
                SM lid: 1
                Capability mask: 0x02510a68
                Port GUID: 0x0002c9020026e4c1
[root at ts-raid6-03 lib64]# ibstatus
Infiniband device 'mthca0' port 1 status:
        default gid:     fe80:0000:0000:0000:0002:c902:0026:e4c1
        base lid:        0x13
        sm lid:          0x1
        state:           4: ACTIVE
        phys state:      5: LinkUp
        rate:            2.5 Gb/sec (1X)




> It's likely a rate issue where the negotiated port rate is not the 
> broadcast group rate.

> What does ibstat or ibstatus show when the join fails ? Also, what 
> about saquery -g ?

> >
> > Rebooting the node that failed to join the group always seems to
solve 
> > the problem.

> Yes, that's consistent with the negotiated rate being a problem.

> -- Hal