From: Gregory Maxwell <greg@linuxpower.cx>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] How to measure jitter & packet loss?
Date: Sun, 25 Mar 2001 06:59:25 +0000 [thread overview]
Message-ID: <marc-lartc-98550359908154@msgid-missing> (raw)
In-Reply-To: <marc-lartc-98549430031544@msgid-missing>
On Sun, Mar 25, 2001 at 12:33:20PM +0800, Rick Goh wrote:
> Inter-packet gaps if too big may cause real-time application to have
> jitters. But how do i measure the jitter if supposedly i send out a tcp/udp
> stream??
>
> Attached is an extract of tcpdump data.
>
> Any information on how to post-analyse tcpdump for jitter, packet loss is
> very very much appreciated.
The text format isn't very useful for me. :) Tcpdump binary would be much
better.
What I normally do is a binary capture set to only grab the flows I'm
interested in (i.e. no spurious arp activity like your dump), then I run the
binary output back through tcpdump with it set to delta time mode once for
each flow with the right filters to isolate the flow.
Then I can import the resulting data into R (a freesoftware statistics
package) where I can see and analyze the delay characterize of the flow.
It's also useful to gather the same data on the transmit side and see how
the statistics differ.
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prev parent reply other threads:[~2001-03-25 6:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-25 4:33 [LARTC] How to measure jitter & packet loss? Rick Goh
2001-03-25 6:59 ` Gregory Maxwell [this message]
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