RHEL6.2 Link is Down happens irregularly by INTEL NIC X540.

Issue

• INTEL 10GNIC of customer's BOX irregularly downs Link.
• The temperature message is recorded and inform this message of known issue about the relation.

Jul  6 06:30:55 localhost kernel: [Hardware Error]: Machine check events logged
Jul  6 06:30:55 localhost mcelog: Processor 20 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 4 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 4 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 20 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 0 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 2 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 18 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 6 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 22 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 8 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 24 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 10 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 26 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 28 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 12 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 30 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 14 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 0 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 2 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 18 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 6 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 22 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 8 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 24 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 10 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 26 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 28 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 12 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 30 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 14 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 16 below trip temperature. Throttling disabled
Jul  6 06:30:55 localhost mcelog: Processor 16 below trip temperature. Throttling disabled
Jul  6 06:55:53 localhost kernel: ixgbe 0000:01:00.0: em1: NIC Link is Down
Jul  6 06:55:57 localhost kernel: ixgbe 0000:01:00.0: em1: NIC Link is Up 10 Gbps, Flow Control: RX/TX
Jul  6 06:55:58 localhost kernel: ixgbe 0000:01:00.0: em1: NIC Link is Down
Jul  6 06:55:59 localhost kernel: ixgbe 0000:01:00.0: em1: NIC Link is Up 10 Gbps, Flow Control: RX/TX
Jul  6 06:55:59 localhost kernel: connection1:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4350537676, last ping 4350542676, now 4350547676
Jul  6 06:55:59 localhost kernel: connection1:0: detected conn error (1011)
Jul  6 06:55:59 localhost kernel: connection4:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4350537678, last ping 4350542678, now 4350547679
Jul  6 06:55:59 localhost kernel: connection4:0: detected conn error (1011)
Jul  6 06:55:59 localhost kernel: connection2:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4350537679, last ping 4350542679, now 4350547679
Jul  6 06:55:59 localhost kernel: connection2:0: detected conn error (1011)
Jul  6 06:56:00 localhost iscsid: Kernel reported iSCSI connection 1:0 error (1011) state (3)
Jul  6 06:56:00 localhost iscsid: Kernel reported iSCSI connection 4:0 error (1011) state (3)
Jul  6 06:56:00 localhost iscsid: Kernel reported iSCSI connection 2:0 error (1011) state (3)
Jul  6 06:56:02 localhost kernel: connection1:0: detected conn error (1020)
Jul  6 06:56:02 localhost kernel: connection4:0: detected conn error (1020)
Jul  6 06:56:02 localhost kernel: connection2:0: detected conn error (1020)
Jul  6 06:56:03 localhost iscsid: connection1:0 is operational after recovery (1 attempts)
Jul  6 06:56:03 localhost iscsid: connection4:0 is operational after recovery (1 attempts)
Jul  6 06:56:03 localhost iscsid: connection2:0 is operational after recovery (1 attempts)
Jul  6 07:33:12 localhost kernel: CPU4: Core power limit notification (total events = 136)
Jul  6 07:33:12 localhost kernel: CPU20: Core power limit notification (total events = 136)
Jul  6 07:33:12 localhost kernel: CPU20: Package power limit notification (total events = 136)
Jul  6 07:33:12 localhost kernel: CPU4: Package power limit notification (total events = 136)