timestample and accuracy

[Xinwen - Fu <xinwenfu () cs tamu edu>]

hi, 
        I have a  few questions here:
1. tcpdump gives us the time stample of each packet. Who prints this
timestamp? network card, network card driver or others?

2. Is it possible that network cards (e.g., 3com)  buffer two or more
packets, and then
transfer the two packets at one time to OS by one network card
hardware interrupt? Then two packets get the same time stample?

        Thanks!!!


Xinwen Fu


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