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pingimplementations usegettimeofday(3)to calculate round-trip times. As a result,pingmay print incorrect results if your system time is not reliable.pingimplementation does usegettimeofday. However, I checked those results with Wireshark and it shows the same behavior (2 ms decrements). Therefore, I don't thinkgettimeofdayis the culprit...nobody caredmessages and the ping results are probably related. Is the8139toothe right driver? In the past there been some issue with the8139cp. Have some option on insert? Some debug option maybe? On/proc/interruptsthere's some other driver using 15?