Date: Sat, 26 May 2001 21:40:14 +0200 From: Jesper Skriver <jesper@FreeBSD.org> To: Harkirat Singh <singh@pdx.edu> Cc: Josh Paetzel <jpaetzel@hutchtel.net>, freebsd-net@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: UDP - Reliable throughput mesaurement Message-ID: <20010526214014.C95985@skriver.dk> In-Reply-To: <Pine.GSO.4.31.0105261220170.18859-100000@freke.odin.pdx.edu>; from singh@pdx.edu on Sat, May 26, 2001 at 12:24:45PM -0700 References: <01052614133701.54532@mark9.vladsempire.net> <Pine.GSO.4.31.0105261220170.18859-100000@freke.odin.pdx.edu>
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On Sat, May 26, 2001 at 12:24:45PM -0700, Harkirat Singh wrote: > On Sat, 26 May 2001, Josh Paetzel wrote: > > > On Saturday 26 May 2001 13:51, Harkirat Singh wrote: > > > > > Hello! > > > > > > I want to measure UDP thruput of lossy channel, is there any > > > tool which tests it? I looked at some of the tools but these do > > > not take care of loss, I mean no retransmisson, just measure raw > > > thruput of UDP (TTCP is one of these). > > > > > > I am looking for a measurement tool which should retransmit in > > > case of loss and keep a track of packets, I mean make UDP reliable > > > amd blocking calls. > > > > > > Thanks, > > > > > > Harkirat > > > > Uhhmmm, seeing as UDP is specifically designed as being "lossy" I > > don't think there is going to be anything that can help you out > > there. There is a really good protocol that you can use if you need > > "reliable" delivery of packets over IP. If I remember right, it is > > called TCP. > > > > Josh > > I specifically want to see the performance of UDP in lossy channel, I > am sure there must be some tool to measure it, I doing a kind of study > and want to analyse TCP vs. UDP! But when you want retransmission of UDP, you have to implement it in the application layer, and then you're actually measureing the performance of your application (and how it's retransmission algoritems compare to those of TCP) as much as your measureing the performance of UDP vs. TCP. /Jesper -- Jesper Skriver, jesper(at)skriver(dot)dk - CCIE #5456 Work: Network manager @ AS3292 (Tele Danmark DataNetworks) Private: FreeBSD committer @ AS2109 (A much smaller network ;-) One Unix to rule them all, One Resolver to find them, One IP to bring them all and in the zone to bind them. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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