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I just found that my dmesg is flooded my the following messages: [10269.950189] gem 0002:20:0f.0: eth0: RX MAC fifo overflow smac[00844c24] [10367.275268] gem 0002:20:0f.0: eth0: RX MAC fifo overflow smac[00844c24] I'll try to check whether this issue exists in a previous available kernels (kernel-2.6.38.8-34.fc15.ppc and kernel-3.0-0.rc3.git0.3.fc16.ppc).
I haven't seen this with later kernel versions, please reopen if this issue still exists for you.