Re: Packets dropped !!!

To: iperf-users --at-- dast.nlanr.net
Subject: Re: Packets dropped !!!
From: Jim Ferguson <ferguson --at-- ncsa.uiuc.edu>
Date: Mon, 23 Feb 2004 10:49:45 -0600
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In-reply-to: <Pine.LNX.4.44.0402221627050.24657-100000 --at-- osage.ncsa.uiuc.edu>
References: <000801c3f98e$c42531b0$3ec3b650 --at-- onorati>
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At 04:33 PM 2/22/2004 -0600, you wrote:
>This means that packets were dropped from the logging. Not that the
>packets were not sent on the wire. Due to the high CPU utilization of
>Iperf it is hard to listen to all the traffic with TCPDump which is also
>on the high side of utilization especially if you are dumping to disk or
>gziping or other entensive tasks. If Iperf reports no lost datagrams then
>there were no lost datagrams between the two copies of Iperf running not



>that some other app saw them all. When in doubt believe Iperf.   <<<---

Our new advertising slogan!  That, and "Trust us, all of your problems are 
nails"


>Kevin
>
>On Sun, 22 Feb 2004, Massimo Onorati wrote:
>
> > I am using  Jperf measurement tool in UDP mode, it shows lost datagrams
> > = 0  but if  I use the following command :"tcpdump -i eth2"  the system
> > tells me : "1020 packets dropped by  Kernel".  Why ?
> >
> > Thanks in advaqnce.
> >

Follow-Ups:
- Reason to drop packets
  - From: onorati_m --at-- virgilio.it

References:
- Packets dropped !!!
  - From: "Massimo Onorati"
- Re: Packets dropped !!!
  - From: Kevin Gibbs

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