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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: jumbo frames
In both cases, it is a bandwidth issue. You either consume the bandwidth in the CPU or consume it on the wire. CPU is cheaper and often under-utilized. Of the two, CPU bandwidth is also cheaper/easier to upgrade. > -----Original Message----- > From: Rowland, Alan D [mailto:[email protected]] > Sent: Friday, April 27, 2001 8:45 AM > To: 'Kurt Kayser'; Tony Hain > Cc: Roeland Meyer; John Fraizer; Paul Lantinga; [email protected] > Subject: RE: jumbo frames > > > I am not an EE but maybe if you rephrased the question as > > Which is greater, the cpu cycles to assemble/dissemble jumbo > frames or the > additional cycles/bandwidth of more numerous ACK packets? > > Then again, I may be way out of my depth here. > > -Al > > -----Original Message----- > From: Kurt Kayser [mailto:[email protected]] > Sent: Friday, April 27, 2001 8:07 AM > To: Tony Hain > Cc: Roeland Meyer; John Fraizer; Paul Lantinga; [email protected] > Subject: Re: jumbo frames > > > > Hi, > > Isn't it a lot more cpu-intensive to 'collect' some 1500-byte frames > into some larger bucket, reassemble it into a jumbo-frame > when the next > box has to chop it in order to send it out on a Sonet/PPP/etc > interface > which > might have a smaller MTU again? > > Doesn't make too much sense to me. I guess that was Tony's > aim as well.. > > Kurt > > > Roeland you are talking about jumbo frames from the end > system lan, while > > John is talking about only using the jumbo frames between > the routers. My > > point was that in John's environment the packets will all > be 1500 since > the > > packets are restricted to that size just to get to the > router with the GE > > interface. I understand that there are perf gains as long > as the entire > path > > supports the larger packets, but I don't understand the > claim that having > a > > bigger pipe in the middle helps. > > > > Tony > > > -- > noris network AG * tel +49 911 93 52-0 * internet > Kilianstra�e 142 * fax +49 911 93 52-100 * solution > 90425 N�rnberg * http://www.noris.net * provider >
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