kernel error message

can someone please tell me what this means.
it was in /var/log/messages

server went down for 1 hr and then came back again.

Sep 27 14:12:17 ns kernel: eth0: Transmit timed out: status 0090 0c00 at 20661409/20661469 command 000ca000.
Sep 27 14:12:25 ns kernel: NETDEV WATCHDOG: eth0: transmit timed out
Sep 27 14:12:25 ns kernel: eth0: Transmit timed out: status 0090 0c00 at 20661649/20661709 command 000ca000.
Sep 27 14:12:33 ns kernel: NETDEV WATCHDOG: eth0: transmit timed out
Sep 27 14:12:33 ns kernel: eth0: Transmit timed out: status 0090 0c00 at 20661889/20661949 command 000ca000.
Sep 27 14:12:41 ns kernel: NETDEV WATCHDOG: eth0: transmit timed out
Sep 27 14:12:41 ns kernel: eth0: Transmit timed out: status 0090 0c00 at 20662129/20662189 command 000ca000.

 

 

 

 

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