3 Replies Latest reply on Feb 25, 2014 3:13 AM by yairi

    max_mtu on centos5 vs. centos6

    wesb

      Hi,

       

      I am using ConnectX-2 cards in connected mode for IB tests

       

      centos5:

      ibv_devinfo | grep max_mtu

                  max_mtu:        2048 (4)

       

      centos6:

      ibv_devinfo | grep max_mtu

                  max_mtu:        4096 (5)

       

      qperf test run fine.

      When testing with ib_* tools I need to specify lower MTU explicitly for the test between centos5 and centos6 to suceeed for example

      'ib_write_bw -m 2048' on centos6 node

       

      Is there a way to increase max_mtu on centos5 to 4096 while keeping vendors kernel?