nanog mailing list archives
I found the missing 30 milliseconds!
From: "Kent W. England" <kwe () geo net>
Date: Tue, 16 Sep 1997 13:01:53 -0700
Everyone; You can't send a packet out an interface until the entire packet has been received on the incoming interface. Now if we assume 1500 byte packets (the new de facto MTU on all modern Internet backbones) and DS-3 pipes, then it takes about 250 microseconds to buffer the pkt on each hop. Since the US internet backbone from coast to coast is about 120 hops, there's your 30 milliseconds and Bob's your uncle. Did I do the arithmetic right? --Kent, ever helpful with NANOG metrication ;-) Well, back when us old guys were young, switching delay *was* significant. Did I ever show you my p4200?
Current thread:
- Re: Physical transport media, (continued)
- Message not available
- Re: Physical transport media Jay R. Ashworth (Sep 16)
- Message not available
- Re: NANOG-PHYSICS (was Re: ATM (was Re: too many routes)) Geoff Huston (Sep 15)
- Re: ATM (was Re: too many routes) Randy Bush (Sep 18)
- Re: ATM (was Re: too many routes) Tim Pozar (Sep 15)
- Re: ATM (was Re: too many routes) Sean M. Doran (Sep 11)
- Re: ATM (was Re: too many routes) Vadim Antonov (Sep 11)
- Re: ATM (was Re: too many routes) Nathan Stratton (Sep 12)
- Re: ATM (was Re: too many routes) Richard Irving (Sep 12)
- Re: ATM (was Re: too many routes) Vadim Antonov (Sep 12)
- Re: ATM (was Re: too many routes) Richard Irving (Sep 12)
- I found the missing 30 milliseconds! Kent W. England (Sep 16)
- Re: I found the missing 30 milliseconds! Craig A. Huegen (Sep 16)
- Message not available
- Re: I found the missing 30 milliseconds! Jay R. Ashworth (Sep 16)
- Re: I found the missing 30 milliseconds! Taner Halicioglu (Sep 16)
- Re: I found the missing 30 milliseconds! Kent W. England (Sep 17)
- Re: ATM (was Re: too many routes) Robert E. Seastrom (Sep 12)
- Re: ATM (was Re: too many routes) Michael Dillon (Sep 12)
- Re: ATM (was Re: too many routes) Dorian R. Kim (Sep 12)
- Re: ATM (was Re: too many routes) Tony Li (Sep 12)
- Re: ATM (was Re: too many routes) Paul Traina (Sep 12)
- Re: ATM (was Re: too many routes) Steve Goldstein (Sep 12)