Hal, We worked this out - once Eli poked me into digging deeper I noticed that the tester was bringing up the child interfaces by hand instead of at boot time - so the options weren't getting set correctly.
-- Michael Heinz Principal Engineer, Qlogic Corporation King of Prussia, Pennsylvania -----Original Message----- From: Hal Rosenstock [mailto:hal.rosenst...@gmail.com] Sent: Monday, June 01, 2009 11:54 AM To: Mike Heinz Cc: general@lists.openfabrics.org Subject: Re: [ofa-general] Ipoib child interfaces are created in dgram mode, even if the config file (and main interface) specify connected mode. On Mon, Jun 1, 2009 at 10:01 AM, Mike Heinz <michael.he...@qlogic.com> wrote: > One of our testers recently reported that he was getting different > performance numbers from IPOIB depending on whether he was using interface > ib0 or a child interface he had created with > /sys/class/netib0/create_child. > > > > Investigating, I noticed that the two interfaces have different MTU sizes: > > > > ib0 Link encap:UNSPEC HWaddr > 80-00-00-02-FE-80-00-00-00-00-00-00-00-00-00-00 > > inet addr:172.21.33.58 Bcast:172.21.255.255 Mask:255.255.0.0 > > inet6 addr: fe80::211:7500:ff:8fa4/64 Scope:Link > > UP BROADCAST RUNNING MULTICAST MTU:65520 Metric:1 > > RX packets:76 errors:0 dropped:0 overruns:0 frame:0 > > TX packets:23147668 errors:0 dropped:0 overruns:0 carrier:0 > > collisions:0 txqueuelen:256 > > RX bytes:5284 (5.1 Kb) TX bytes:17365044664 (16560.5 Mb) > > > > ib0.9001 Link encap:UNSPEC HWaddr > 80-00-00-06-FE-80-00-00-00-00-00-00-00-00-00-00 > > inet addr:172.21.34.58 Bcast:172.21.255.255 Mask:255.255.0.0 > > inet6 addr: fe80::211:7500:ff:8fa4/64 Scope:Link > > UP BROADCAST RUNNING MULTICAST MTU:2044 Metric:1 > > RX packets:60413619 errors:0 dropped:0 overruns:0 frame:0 > > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > > collisions:0 txqueuelen:256 > > RX bytes:112572449188 (107357.4 Mb) TX bytes:0 (0.0 b) > > > > > > This leads me to believe that the child interface is in datagram mode even > though the parent is in connected mode. > > > > Is this expected behavior? Is there a way to change this? Can the child interface's mode (/sys/class/net/ib0.9001/mode) be changed (to connected) ? See Documentation/ipoib.txt -- Hal > -- > > Michael Heinz > > Principal Engineer, Qlogic Corporation > > King of Prussia, Pennsylvania > > _______________________________________________ > general mailing list > general@lists.openfabrics.org > http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general > > To unsubscribe, please visit > http://openib.org/mailman/listinfo/openib-general >
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