thanks a lot
---------[ Received Mail Content ]----------
Subject : [Tcpreplay-users] tcpreplay 3.3 RC2
Date : Wed, 30 Apr 2008 23:22:11 -0700
From : "Aaron Turner" <[EMAIL PROTECTED]>
To : "Main forum for tcpreplay" <tcpreplay-users@lists.sourceforge.net>
So I've merged in the new high-accuracy timing performance code into
the mainline trunk and released 3.3.rc2. Depending on your operating
system you may or may not notice any improvement, but here's the
rundown of the changes:
- Add support for OS X's AbsoluteTime() functions which are *really* accurate!
- Add support for the Intel RDTSC which is pretty good
- Add support for IO Port 80, another method which is decent, but not great
- Add support for select() which is pretty much worthless so far
- Internally track packet timing with nanosecond accuracy (necessary
for sub 1usec accuracy)
- Add support for rounding sleep times for non-absolute timing methods
(Mbps, etc) since most timing methods are +1usec accurate
- Track time since last packet was sent rather then just calculating intervals
- Give users the ability to accelerate time by using a sleep modifier
Linux users wanting the most accurate timing should use a recent 2.6
kernel with the HPET timer code enabled for gettimeofday (check your
kernel config) and specify --timer=gtod.
OS X users should definitely use --timer=abstime for the
AbsoluteTime() methods.
Any recent Intel/AMD/SPARC system probably supports the RDTSC timer.
Depending on your hardware it may be accurate or horribly inaccurate.
Generally speaking, older Intel CPU's (P4's, etc) are more accurate
and the newer CPU's (Core2Duo, etc) aren't accurate at all.
Most users will probably find the most success with one of
--timer=gtod, rdtsc or abstime.
Other operating systems should try different settings and let me know
what works! If anyone knows of any code (the more cross platform the
better) for directly reading from the Intel HPET (rather then
indirectly via gettimeofday) let me know and I'll try to integrate it
in.
Anyways, I haven't yet updated the wiki docs with descriptions for
these changes, so check the man pages. Hopefully I'll have something
up in a day or two.
http://synfin.net/tcpreplay-3.3.rc2.tar.gz
--
Aaron Turner
http://synfin.net/
http://tcpreplay.synfin.net/ - Pcap editing & replay tools for Unix
They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety. -- Benjamin Franklin
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