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Currently the MRG/RT 2.0 (2.6.33.9-rt-31.74) does not have a cxgb4 driver available. This driver should be enabled.
Is this driver enabled in kernel-rt-3.0.9-rt26.46.el6rt?
I see this via modinfo cxgb4 ... /lib/modules/3.0.9-rt26.46.el6rt.x86_64/kernel/drivers/net/cxgb4/cxgb4.ko # rpm -qf /lib/modules/3.0.9-rt26.46.el6rt.x86_64/kernel/drivers/net/cxgb4/cxgb4.ko kernel-rt-3.0.9-rt26.46.el6rt.x86_64 This is enabled again in the MRG 2.1 Realtime -> Closing it.