nanog mailing list archives
Re: 10g residential CPE
From: Mikael Abrahamsson via NANOG <nanog () nanog org>
Date: Sat, 26 Dec 2020 18:55:26 +0100 (CET)
On Sat, 26 Dec 2020, Baldur Norddahl wrote:
It is true there have been TCP improvements but you can very easily verify for yourself that it is very hard to get anywhere near 1 Gbps of actual transfer speed to destinations just 10 ms away. Try the nlnog ring network like this: gigabit@gigabit01:~$ iperf -c netnod01.ring.nlnog.net ------------------------------------------------------------ Client connecting to netnod01.ring.nlnog.net, TCP port 5001 TCP window size: 85.0 KByte (default) ------------------------------------------------------------ [ 3] local 185.24.168.23 port 50632 connected with 185.42.136.5 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 452 MBytes 379 Mbits/sec
Why would you just use 85KB of TCP window size?That's not the problem of buffering (or lack thereof) along the path, that just not enough TCP window size for long-RTT high speed transfers.
-- Mikael Abrahamsson email: swmike () swm pp se
Current thread:
- Re: 10g residential CPE, (continued)
- Re: 10g residential CPE Mel Beckman (Dec 25)
- Re: 10g residential CPE Mark Tinka (Dec 25)
- Re: 10g residential CPE Niels Bakker (Dec 26)
- Re: 10g residential CPE Mark Tinka (Dec 26)
- Re: 10g residential CPE Mikael Abrahamsson via NANOG (Dec 26)
- Re: 10g residential CPE Mark Tinka (Dec 26)
- Re: 10g residential CPE Mikael Abrahamsson via NANOG (Dec 26)
- Re: 10g residential CPE Baldur Norddahl (Dec 26)
- Re: 10g residential CPE Mikael Abrahamsson via NANOG (Dec 26)
- Re: 10g residential CPE Baldur Norddahl (Dec 26)
- Re: 10g residential CPE Mikael Abrahamsson via NANOG (Dec 26)
- Re: 10g residential CPE Baldur Norddahl (Dec 26)
- Re: 10g residential CPE Mikael Abrahamsson via NANOG (Dec 26)
- Re: 10g residential CPE Baldur Norddahl (Dec 26)
- Re: 10g residential CPE Filip Hruska (Dec 26)
- Re: 10g residential CPE Baldur Norddahl (Dec 26)
- Re: 10g residential CPE Mel Beckman (Dec 26)
- Re: 10g residential CPE Michael Thomas (Dec 26)
- Re: 10g residential CPE Mark Tinka (Dec 26)
- Re: 10g residential CPE Mark Tinka (Dec 26)
- Re: 10g residential CPE Jared Mauch (Dec 28)