Cell Relay Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: Lower bound for maximum ATM bandwidth?
Steffen Jahn wrote: [snip] > 3. SONET OC3c operates at 3 * 9 * 90 * 8 * 8000/s = 155.520 mb/s > Available for ATM 149.760 mb/s > Available for ATM Adaption Layer about 135.632 mb/s > ============ > > The maximum throughput i ever got, was about 133 mb/s with UDP-over-ATM > (mtu 9180, packet size 9140). But with all TCP/IP, LLC and AAL5 overhead, > you can get theoretical about 134.5 mb/s. Anyone got so much with UDP or > over an ATM API? Your calculations are correct. On an unloaded switch, we could achieve with both UDP and TCP about 133-134 Mbit/s. But, reaching such maximas is -beside parameters such as socket-size, message-size, etc.- rather a question of computing power. E.g. when using LANE (MTU 1500) instead of ClassicalIP, ForeIP (MTU9180/9188) causing additional protocol stack processing, our TCP/UDP results using ULTRA 1's decreased from about 133 to about 95 Mb/s. For a comparision of some different platforms you can have a look at our webpage, http://www.iaik.tu-graz.ac.at/RESEARCH/ATM/performance.html or the "netperf submitted results" page via the Netperf page http://www.cup.hp.com/netperf/NetperfPage.html Regards Herbert -- Herbert Leitold (email: hleitold@iaik.tu-graz.ac.at) IAIK Klosterwiesgasse 32/I A-8010 GRAZ Austria URL.: <http://www.iaik.tu-graz.ac.at/iaik.html> Tel.: ++43 (316) 873 5516 Fax.: ++43 (316) 873 5520 |
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