nanog mailing list archives
Re: Keynote/Boardwatch Results
From: "Alex.Bligh" <amb () xara net>
Date: Wed, 09 Jul 1997 22:12:09 +0100
SYN -> SYN/ACK time (actual connection) 22% Web browser says "Contacting www.website.com..." SYN/ACK -> first data (web server work-- 78% getting material, processing material) Web browser says "www.website.com contacted, waiting for response" Note that this didn't include different types of content. But it *did* truly measure one thing--that the delay caused by web servers is considerably higher than that of "network performance" (or actual connect time).
Urm, maybe I'm missing something here, but taking an incredibly simplistic model where you have a probability p of losing any packet, there is a (1-p)^3 chance of 3 way handshake losing a packet and stalling, and a (1-p)^(2 * no packets reqd for 1st data) for the latter. With slow start etc there are bound to be more than two packets back before it starts processing the response, so the latter is always going to have a higher chance of failing. Now add to the fact that with technology such as ATM, it is more likely large packets will be dropped than small ones (with a given cell loss probability), and being careful to remember all that good stuff at the last but one NANOG about broken client stacks, and I think you might find the above is a "non measurement". I *think* (and am not sure) that if you have a proxy set up, you always get the latter once you have connected to the proxy. Oh, and to skew the figures in the other direction, doesn't the first prompt come up while the DNS lookup is being done? Alex Bligh Xara Networks
Current thread:
- Keynote/Boardwatch Results Jack Rickard (Jul 07)
- Re: Keynote/Boardwatch Results Tony Li (Jul 07)
- Re: Keynote/Boardwatch Results Robert Laughlin (Jul 08)
- Re: Keynote/Boardwatch Results pete (Jul 08)
- Re: Keynote/Boardwatch Results John Leong (Jul 09)
- Re: Keynote/Boardwatch Results Avi Freedman (Jul 08)
- <Possible follow-ups>
- Re: Keynote/Boardwatch Results Jack Rickard (Jul 09)
- Re: Keynote/Boardwatch Results Craig A. Huegen (Jul 09)
- Re: Keynote/Boardwatch Results Deepak Jain (Jul 09)
- Re: Keynote/Boardwatch Results Alex.Bligh (Jul 09)
- Re: Keynote/Boardwatch Results Craig A. Huegen (Jul 09)
- Re: Keynote/Boardwatch Results James R Grinter (Jul 16)
- Re: Keynote/Boardwatch Results Craig A. Huegen (Jul 09)
- Re: Keynote/Boardwatch Results Jesse Caulfield (Jul 09)
- Re: Keynote/Boardwatch Results Golan Ben-Oni (Jul 09)