Some discussion at the TAG f2f involved glancing reference to the question of whether SPDY would improve browser (user) experience. I did a _tiny_ experiment to just see what kind of numbers I would find. Here are the results. I offer them more as a stimulus to thinking about just how complicated it is to get a handle on the above question, how many conditions have to be controlled for, etc., than anything else. I also am aware that there are serious efforts underway to do this 'properly' -- this is rank amateurism. ht ------------------ Fetching www.weather.com on 2012-06-13 produces 119 requests according to fiddler, and then starts polling for some updating flash frame(s). Response codes are as follows: 112 200 1 204 6 302 -------- Sites are as follows: 34 i.imwx.com 14 s.imwx.com 12 www.weather.com 9 ad.doubleclick.net --- 69 == 58% 7 b.imwx.com 7 d.imwx.com --- 83 == 70% 6 s0.2mdn.net 4 cp30559.edgefcs.net 4 pix04.revsci.net 2 admin.brightcove.com 2 b.scorecardresearch.com 2 odc.weather.com 2 secure-us.imrworldwide.com 2 speed.pointroll.com --- 107 == 90% 1 x 12 So, exponential/Zipf, not normal 90% of the requests are to 54% (14 out of 26) of the hosts At least *.imwx.com and edgefcs (manages flash polling) are akamai ------- Traffice to the top 14 hosts measured in bytes n mean total s.d. i.imwx.com 34 6271.62 213235 8354.51 * s.imwx.com 14 8070.86 112992 6678.07 * www.weather.com 12 8742.17 104906 13313.3 * ad.doubleclick.net 9 498.556 4487 526.193 b.imwx.com 7 43 301 0 d.imwx.com 7 16518 115626 17250 * s0.2mdn.net 6 4869.33 29216 5155.37 cp30559.edgefcs.net 4 72.5 290 81.0987 pix04.revsci.net 4 257.5 1030 193.736 admin.brightcove.com 2 12929 25858 5051.57 b.scorecardresearch.com 2 570 1140 806.102 odc.weather.com 2 21.5 43 30.4056 secure-us.imrworldwide. 2 93.5 187 54.4472 speed.pointroll.com 2 63357.5 126715 61188.1 12 more 1 4004.58 48055 6225.55 Total 119 6588.92 784081 12875 *ed lines say that 4 sites account for 56% of the requests and 70% of the bytes Number of requests and bytecount are roughly correlated (spearman rank correlation .51, p<.01), with speed.pointroll.com being the obvious outlier) -- Henry S. Thompson, School of Informatics, University of Edinburgh 10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440 Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk URL: http://www.ltg.ed.ac.uk/~ht/ [mail from me _always_ has a .sig like this -- mail without it is forged spam]Received on Wednesday, 13 June 2012 19:37:03 UTC
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