Hi, This warning is normal. If you don't need Multicast then it is of no concern at all. If you have an app that uses multicast then you will have to limit the MTU (In this case you might be better off using reliable transmission - not connected mode).
Rob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Wiegers, Bert Sent: 18 May 2009 12:11 To: [email protected] Subject: [ofa-general] MTU in IPoIB Hi, In our default-setup we are using IPoIB. This is set up with a MTU of 65520 ib0 Link encap:UNSPEC HWaddr 80-00-00-48-FE-80-00-00-00-00-00-00-00-00-00-00 inet addr:10.75.107.32 Bcast:10.75.255.255 Mask:255.255.0.0 inet6 addr: fe80::214:4fa4:d3ba:25/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:65520 Metric:1 RX packets:9318 errors:0 dropped:0 overruns:0 frame:0 TX packets:4197 errors:0 dropped:10 overruns:0 carrier:0 collisions:0 txqueuelen:4096 RX bytes:25032362 (23.8 Mb) TX bytes:636320 (621.4 Kb) Our dmesg on the other hand shows these hints: ib_core: module not supported by Novell, setting U taint flag. ib_mad: module not supported by Novell, setting U taint flag. ib_mthca: module not supported by Novell, setting U taint flag. mlx4_ib: module not supported by Novell, setting U taint flag. mlx4_ib: Mellanox ConnectX InfiniBand driver v1.0 (April 4, 2008) ib_ipath: module not supported by Novell, setting U taint flag. cxgb3: module not supported by Novell, setting U taint flag. iw_cxgb3: module not supported by Novell, setting U taint flag. ib_umad: module not supported by Novell, setting U taint flag. NET: Registered protocol family 10 lo: Disabled Privacy Extensions IPv6 over IPv4 tunneling driver ib_uverbs: module not supported by Novell, setting U taint flag. ib_sa: module not supported by Novell, setting U taint flag. ib_cm: module not supported by Novell, setting U taint flag. ib_ipoib: module not supported by Novell, setting U taint flag. ADDRCONF(NETDEV_UP): ib0: link is not ready ib0: enabling connected mode will cause multicast packet drops ib0: mtu > 2044 will cause multicast packet drops. ib0: mtu > 2044 will cause multicast packet drops. ib1: enabling connected mode will cause multicast packet drops ib1: mtu > 2044 will cause multicast packet drops. ib1: mtu > 2044 will cause multicast packet drops. ib_addr: module not supported by Novell, setting U taint flag. iw_cm: module not supported by Novell, setting U taint flag. rdma_cm: module not supported by Novell, setting U taint flag. ib_sdp: module not supported by Novell, setting U taint flag. NET: Registered protocol family 27 qlgc_vnic: module not supported by Novell, setting U taint flag. QLGC_VNIC: Initializing QLogic Corp. Virtual NIC (VNIC) driver version 1.3.0.0.4 rdma_ucm: module not supported by Novell, setting U taint flag. scsi_transport_iscsi: module not supported by Novell, setting U taint flag. Loading iSCSI transport class v2.0-869. libiscsi: module not supported by Novell, setting U taint flag. iscsi_tcp: module not supported by Novell, setting U taint flag. iscsi: registered transport (tcp) ib_iser: module not supported by Novell, setting U taint flag. iscsi: registered transport (iser) md: Autodetecting RAID arrays. md: autorun ... md: ... autorun DONE. ib0: multicast join failed for ff12:401b:ffff:0000:0000:0000:ffff:ffff, status -11 ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready eth0: no IPv6 routers present ib0: no IPv6 routers present So should I limit the MTU to 2044? Thanks. Bert _______________________________________________ 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 The SAQ Group Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ SAQ is the trading name of SEMTEC Limited. Registered in England & Wales Company Number: 06481952 http://www.saqnet.co.uk AS29219 SAQ Group Delivers high quality, honestly priced communication and I.T. services to UK Business. Broadband : Domains : Email : Hosting : CoLo : Servers : Racks : Transit : Backups : Managed Networks : Remote Support. ISPA Member Find us in http://www.thebestof.co.uk/petersfield _______________________________________________ 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
