nanog mailing list archives
Re: 60 ms cross-continent
From: Tim Durack <tdurack () gmail com>
Date: Sat, 20 Jun 2020 12:43:10 -0400
And of course in your more realistic example: 2742 miles = 4412 km ~ 44 ms optical rtt with no OEO in the path On Sat, Jun 20, 2020 at 12:36 PM Tim Durack <tdurack () gmail com> wrote:
Speed of light in glass ~200 km/s 100 km rtt = 1ms Coast-to-coast ~6000 km ~60ms Tim:> On Sat, Jun 20, 2020 at 12:27 PM William Herrin <bill () herrin us> wrote:Howdy, Why is latency between the east and west coasts so bad? Speed of light accounts for about 15ms each direction for a 30ms round trip. Where does the other 30ms come from and why haven't we gotten rid of it? c = 186,282 miles/second 2742 miles from Seattle to Washington DC mainly driving I-90 2742/186282 ~= 0.015 seconds Thanks, Bill Herrin -- William Herrin bill () herrin us https://bill.herrin.us/-- Tim:>
-- Tim:>
Current thread:
- 60 ms cross-continent William Herrin (Jun 20)
- Re: 60 ms cross-continent Joe Greco (Jun 20)
- Re: 60 ms cross-continent Tim Požár (Jun 20)
- Re: 60 ms cross-continent Tim Durack (Jun 20)
- Re: 60 ms cross-continent Tim Durack (Jun 20)
- Re: 60 ms cross-continent Dave Cohen (Jun 20)
- Re: 60 ms cross-continent Mel Beckman (Jun 20)
- Re: 60 ms cross-continent Wayne Bouchard (Jun 20)
- Re: 60 ms cross-continent Saku Ytti (Jun 20)
- Re: 60 ms cross-continent Bryan Fields (Jun 20)
- Re: 60 ms cross-continent Martin Hannigan (Jun 20)
- Re: 60 ms cross-continent Saku Ytti (Jun 20)
- Re: 60 ms cross-continent Tim Durack (Jun 20)
- Re: 60 ms cross-continent Tim Požár (Jun 20)
- Re: 60 ms cross-continent Joe Greco (Jun 20)
- Re: 60 ms cross-continent Tony Finch (Jun 21)
- Re: 60 ms cross-continent Alejandro Acosta (Jun 20)