Subject: Re: tcptrace [OFFTOPIC?] Looking for cheap timestamping... From: Simon Leinen <simon@limmat.switch.ch> Date: Thu, 27 Feb 2003 23:13:04 +0100 Message-ID: <aa3cm9fk3z.fsf@limmat.switch.ch>
On Thu, 27 Feb 2003 12:32:28 -0800, Jeremy Elson <jelson@circlemud.org> said:
> uaca@alumni.uv.es writes:
>> I'm looking for inexpensive Gigabit Ethernet hardware that could attach to
>> Linux with basic packet timestamping capabilities.
> I've never used Gigabit ethernet, but using the libpcap library to
> capture packets gives us excellent timestamps for 100mbit ethernet.
> Most ethernet drivers timestamp packets in the interrupt handler so it
> has fairly low jitter. This timestamp is available if you use libpcap
> to capture the packets, as opposed to the normal socket interface in
> which case it's not available through any mechanism I know.
Newer Linux kernels (>=v2.4) implement SO_TIMESTAMP which can be used
to get kernel timestamps using the socket interface.
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