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List:       winpcap-users
Subject:    Re: [Winpcap-users] About the packets loss ,
From:       Guy Harris <guy () alum ! mit ! edu>
Date:       2010-09-28 16:30:21
Message-ID: A4A42FDA-A328-45C9-BD03-7FBA221B02A4 () alum ! mit ! edu
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On Sep 28, 2010, at 4:22 AM, Helmut Vaupotitsch wrote:

> 1) According to Section 5.3 and Figures 6,9 in \
> http://www.winpcap.org/docs/WinPcap-SBAC03.pdf (small packets), timestamp \
> optimization is switched off in the standard distribution, which costs *a lot* of \
> cpu processing.

According to section 5.3, "This high performance counter is incremented at every \
processor clock cycle, so its precision is equivalent to the CPU frequency"; as far \
as I know, on a lot of machines there is no guarantee that the CPU frequency is a \
constant, at least with some operating systems, so it might be Really Hard to turn \
the TSC value into a reasonable time stamp on those machines.

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