[ofa-general] IPoIB, OFED 1.2.5, and multicast groups.

[Eli Cohen]

IPOIB does not initiate a join to a mulitcast group (except for the
broadcast group). This comes from routing protocols or use space
sockets. Do you run processes that use many different multicast groups?


On Fri, 2008-01-11 at 19:36 -0800, Ira Weiny wrote:
> I don't really understand the innerworkings of IPoIB so forgive me if this is a
> really stupid question but:
> 
>    Is it a bug that there is a Multicast group created for every node in our
>    clusters?
> 
> If not a bug why is this done?  We just tried to boot on a 1151 node cluster
> and opensm is complaining there are not enough multicast groups.
> 
>    Jan 11 18:30:42 728984 [40C05960] -> __get_new_mlid: ERR 1B23: All available:1024 mlids are taken
>    Jan 11 18:30:42 729050 [40C05960] -> osm_mcmr_rcv_create_new_mgrp: ERR 1B19: __get_new_mlid failed
>    Jan 11 18:30:42 730647 [40401960] -> __get_new_mlid: ERR 1B23: All available:1024 mlids are taken
>    Jan 11 18:30:42 730691 [40401960] -> osm_mcmr_rcv_create_new_mgrp: ERR 1B19: __get_new_mlid failed
> 
> 
> Here is the output from my small test cluster:  (ibnodesinmcast uses saquery a
> couple of times to print this nice report.)
> 
> 
>    19:17:24 > whatsup
>    up:   9: wopr[0-7],wopri
>    down: 0:
>    root at wopri:/tftpboot/images
>    19:25:03 > ibnodesinmcast -g
>    0xC000 (0xff12401bffff0000 : 0x00000000ffffffff)
>       In  9: wopr[0-7],wopri
>       Out 0: 0
>    0xC001 (0xff12401bffff0000 : 0x0000000000000001)
>       In  9: wopr[0-7],wopri
>       Out 0: 0
>    0xC002 (0xff12601bffff0000 : 0x00000001ff2265ed)
>       In  1: wopr3
>       Out 8: wopr[0-2,4-7],wopri
>    0xC003 (0xff12601bffff0000 : 0x0000000000000001)
>       In  9: wopr[0-7],wopri
>       Out 0: 0
>    0xC004 (0xff12601bffff0000 : 0x00000001ff222729)
>       In  1: wopr4
>       Out 8: wopr[0-3,5-7],wopri
>    0xC005 (0xff12601bffff0000 : 0x00000001ff219e65)
>       In  1: wopri
>       Out 8: wopr[0-7]
>    0xC006 (0xff12601bffff0000 : 0x00000001ff00232d)
>       In  1: wopr6
>       Out 8: wopr[0-5,7],wopri
>    0xC007 (0xff12601bffff0000 : 0x00000001ff002325)
>       In  1: wopr7
>       Out 8: wopr[0-6],wopri
>    0xC008 (0xff12601bffff0000 : 0x00000001ff228d35)
>       In  1: wopr1
>       Out 8: wopr[0,2-7],wopri
>    0xC009 (0xff12601bffff0000 : 0x00000001ff2227f1)
>       In  1: wopr2
>       Out 8: wopr[0-1,3-7],wopri
>    0xC00A (0xff12601bffff0000 : 0x00000001ff219ef1)
>       In  1: wopr0
>       Out 8: wopr[1-7],wopri
>    0xC00B (0xff12601bffff0000 : 0x00000001ff0021e9)
>       In  1: wopr5
>       Out 8: wopr[0-4,6-7],wopri
> 
> 
> Each of these MGIDS of the prefix (0xff12601bffff0000) have just one node in
> them and represent an ipv6 address.  Could you turn off ipv6 with the latest
> IPoIB?
> 
> In a bind,
> Ira
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