nanog mailing list archives
Re: I found the missing 30 milliseconds!
From: "Craig A. Huegen" <c-huegen () quadrunner com>
Date: Tue, 16 Sep 1997 13:41:14 -0700 (PDT)
On Tue, 16 Sep 1997, Kent W. England wrote: That's all well and everything, but I'll put $5 down that says everyone here used standard 56-byte ICMP payload for their pings, which makes the packet less than 100 bytes total. /cah ==>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: NANOG-PHYSICS (was Re: ATM (was Re: too many routes)), (continued)
- 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)
- Re: ATM (was Re: too many routes) Sean M. Doran (Sep 14)