Re: 3g iphone wifi speed

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justin Australian join:1999-05-28 New York, NY kudos:7 Host: IPv6 Business Connectiv.. Console/Handheld g.. Home/Office setup .. Photos of Broadban.. 2 edits	reply to justin Re: 3g iphone wifi speed I made a video, 2g iphone on the right, 3g iphone on the left. Same Wifi network, same server (our image server), same image file. Roughly the same start time. 3g wifi speed 4x slower ... doesn't matter what US image I pick, on what server, same problem: »www.youtube.com/watch?v=92oGshWbKGI Here is the tcptrace of the two transmissions: first, the good one: ./bin.tcptrace.new -G -r -l 2g.dump Ostermann's tcptrace -- version 6.6.7 -- Thu Nov 4, 2004 1823 packets seen, 1823 TCP packets traced elapsed wallclock time: 0:00:00.139788, 13041 pkts/sec analyzed trace file elapsed time: 0:00:18.973276 TCP connection info: 1 TCP connection traced: TCP connection 1: host a: CPE-121-216-114-115.nsw.bigpond.net.au:61595 host b: nfs2:80 complete conn: no (SYNs: 2) (FINs: 0) first packet: Fri Jul 18 06:24:43.977745 2008 last packet: Fri Jul 18 06:25:02.951021 2008 elapsed time: 0:00:18.973276 total packets: 1823 filename: 2g.dump a->b: b->a: total packets: 445 total packets: 1378 ack pkts sent: 444 ack pkts sent: 1378 pure acks sent: 443 pure acks sent: 1 sack pkts sent: 34 sack pkts sent: 0 dsack pkts sent: 0 dsack pkts sent: 0 max sack blks/ack: 2 max sack blks/ack: 0 unique bytes sent: 396 unique bytes sent: 1986504 actual data pkts: 1 actual data pkts: 1376 actual data bytes: 396 actual data bytes: 1992296 rexmt data pkts: 0 rexmt data pkts: 4 rexmt data bytes: 0 rexmt data bytes: 5792 zwnd probe pkts: 0 zwnd probe pkts: 0 zwnd probe bytes: 0 zwnd probe bytes: 0 outoforder pkts: 0 outoforder pkts: 0 pushed data pkts: 1 pushed data pkts: 97 SYN/FIN pkts sent: 1/0 SYN/FIN pkts sent: 1/0 req 1323 ws/ts: Y/Y req 1323 ws/ts: Y/Y adv wind scale: 0 adv wind scale: 2 req sack: Y req sack: Y sacks sent: 34 sacks sent: 0 urgent data pkts: 0 pkts urgent data pkts: 0 pkts urgent data bytes: 0 bytes urgent data bytes: 0 bytes mss requested: 1460 bytes mss requested: 1460 bytes max segm size: 396 bytes max segm size: 1448 bytes min segm size: 396 bytes min segm size: 1296 bytes avg segm size: 395 bytes avg segm size: 1447 bytes max win adv: 65535 bytes max win adv: 6864 bytes min win adv: 1448 bytes min win adv: 6864 bytes zero win adv: 0 times zero win adv: 0 times avg win adv: 56615 bytes avg win adv: 6864 bytes initial window: 396 bytes initial window: 4344 bytes initial window: 1 pkts initial window: 3 pkts ttl stream length: NA ttl stream length: NA missed data: NA missed data: NA truncated data: 366 bytes truncated data: 1951016 bytes truncated packets: 1 pkts truncated packets: 1376 pkts data xmit time: 0.000 secs data xmit time: 18.489 secs idletime max: 700.8 ms idletime max: 469.4 ms throughput: 21 Bps throughput: 104700 Bps RTT samples: 2 RTT samples: 367 RTT min: 0.0 ms RTT min: 235.4 ms RTT max: 0.0 ms RTT max: 556.1 ms RTT avg: 0.0 ms RTT avg: 297.1 ms RTT stdev: 0.0 ms RTT stdev: 63.1 ms RTT from 3WHS: 0.0 ms RTT from 3WHS: 235.4 ms RTT full_sz smpls: 1 RTT full_sz smpls: 365 RTT full_sz min: 0.0 ms RTT full_sz min: 237.9 ms RTT full_sz max: 0.0 ms RTT full_sz max: 556.1 ms RTT full_sz avg: 0.0 ms RTT full_sz avg: 297.5 ms RTT full_sz stdev: 0.0 ms RTT full_sz stdev: 63.2 ms post-loss acks: 0 post-loss acks: 12 For the following 5 RTT statistics, only ACKs for multiply-transmitted segments (ambiguous ACKs) were considered. Times are taken from the last instance of a segment. ambiguous acks: 0 ambiguous acks: 1 RTT min (last): 0.0 ms RTT min (last): 273.3 ms RTT max (last): 0.0 ms RTT max (last): 273.3 ms RTT avg (last): 0.0 ms RTT avg (last): 273.3 ms RTT sdv (last): 0.0 ms RTT sdv (last): 0.0 ms segs cum acked: 0 segs cum acked: 993 duplicate acks: 0 duplicate acks: 30 triple dupacks: 0 triple dupacks: 1 max # retrans: 0 max # retrans: 1 min retr time: 0.0 ms min retr time: 289.1 ms max retr time: 0.0 ms max retr time: 541.0 ms avg retr time: 0.0 ms avg retr time: 361.2 ms sdv retr time: 0.0 ms sdv retr time: 120.2 ms Now the bad one Ostermann's tcptrace -- version 6.6.7 -- Thu Nov 4, 2004 2119 packets seen, 2119 TCP packets traced elapsed wallclock time: 0:00:00.156379, 13550 pkts/sec analyzed trace file elapsed time: 0:01:18.320963 TCP connection info: 1 TCP connection traced: TCP connection 1: host a: CPE-121-216-114-115.nsw.bigpond.net.au:61589 host b: nfs2:80 complete conn: no (SYNs: 2) (FINs: 1) first packet: Fri Jul 18 06:22:50.959222 2008 last packet: Fri Jul 18 06:24:09.280186 2008 elapsed time: 0:01:18.320963 total packets: 2119 filename: 3g.dump a->b: b->a: total packets: 717 total packets: 1402 ack pkts sent: 716 ack pkts sent: 1402 pure acks sent: 715 pure acks sent: 1 sack pkts sent: 128 sack pkts sent: 0 dsack pkts sent: 0 dsack pkts sent: 0 max sack blks/ack: 2 max sack blks/ack: 0 unique bytes sent: 422 unique bytes sent: 1986504 actual data pkts: 1 actual data pkts: 1399 actual data bytes: 422 actual data bytes: 2025600 rexmt data pkts: 0 rexmt data pkts: 27 rexmt data bytes: 0 rexmt data bytes: 39096 zwnd probe pkts: 0 zwnd probe pkts: 0 zwnd probe bytes: 0 zwnd probe bytes: 0 outoforder pkts: 0 outoforder pkts: 0 pushed data pkts: 1 pushed data pkts: 119 SYN/FIN pkts sent: 1/0 SYN/FIN pkts sent: 1/1 req 1323 ws/ts: Y/Y req 1323 ws/ts: Y/Y adv wind scale: 2 adv wind scale: 2 req sack: Y req sack: Y sacks sent: 128 sacks sent: 0 urgent data pkts: 0 pkts urgent data pkts: 0 pkts urgent data bytes: 0 bytes urgent data bytes: 0 bytes mss requested: 1460 bytes mss requested: 1460 bytes max segm size: 422 bytes max segm size: 1448 bytes min segm size: 422 bytes min segm size: 1296 bytes avg segm size: 421 bytes avg segm size: 1447 bytes max win adv: 131768 bytes max win adv: 6864 bytes min win adv: 107152 bytes min win adv: 6864 bytes zero win adv: 0 times zero win adv: 0 times avg win adv: 129236 bytes avg win adv: 6864 bytes initial window: 422 bytes initial window: 2896 bytes initial window: 1 pkts initial window: 2 pkts ttl stream length: NA ttl stream length: 1986504 bytes missed data: NA missed data: 0 bytes truncated data: 392 bytes truncated data: 1983630 bytes truncated packets: 1 pkts truncated packets: 1399 pkts data xmit time: 0.000 secs data xmit time: 72.087 secs idletime max: 5627.0 ms idletime max: 5661.2 ms throughput: 5 Bps throughput: 25364 Bps RTT samples: 2 RTT samples: 552 RTT min: 0.0 ms RTT min: 237.2 ms RTT max: 0.0 ms RTT max: 999.4 ms RTT avg: 0.0 ms RTT avg: 444.9 ms RTT stdev: 0.0 ms RTT stdev: 211.8 ms RTT from 3WHS: 0.0 ms RTT from 3WHS: 291.1 ms RTT full_sz smpls: 1 RTT full_sz smpls: 549 RTT full_sz min: 0.0 ms RTT full_sz min: 237.2 ms RTT full_sz max: 0.0 ms RTT full_sz max: 999.4 ms RTT full_sz avg: 0.0 ms RTT full_sz avg: 445.7 ms RTT full_sz stdev: 0.0 ms RTT full_sz stdev: 212.1 ms post-loss acks: 0 post-loss acks: 31 For the following 5 RTT statistics, only ACKs for multiply-transmitted segments (ambiguous ACKs) were considered. Times are taken from the last instance of a segment. ambiguous acks: 0 ambiguous acks: 15 RTT min (last): 0.0 ms RTT min (last): 85.6 ms RTT max (last): 0.0 ms RTT max (last): 720.2 ms RTT avg (last): 0.0 ms RTT avg (last): 305.6 ms RTT sdv (last): 0.0 ms RTT sdv (last): 130.8 ms segs cum acked: 0 segs cum acked: 776 duplicate acks: 1 duplicate acks: 115 triple dupacks: 0 triple dupacks: 11 max # retrans: 0 max # retrans: 1 min retr time: 0.0 ms min retr time: 557.4 ms max retr time: 0.0 ms max retr time: 1229.9 ms avg retr time: 0.0 ms avg retr time: 754.5 ms sdv retr time: 0.0 ms sdv retr time: 211.8 ms The problem is visible in these details: highly variable RTT time for the 3G phone leads to stalls & congestion avoidance (slowdowns). It isn't sending back ACKs fast enough.
	to forum · permalink · 2008-07-18 07:38:47 ·
macaholic Premium join:2003-08-31 Jackson Heights, NY	if you send this info to Apple maybe the fix will be included the next software update for the iPhone that brings it out of the beta program (i.e. rush this out fix it later). Like I've been told by so many here..it's probably your internet provider's implementation of routing. Maybe you can get your provider to update their hardware so the 3g can work properly. -- "You don't subject minority rights to a referendum." Justice Minister Irwin Cotler of Canada
	to forum · permalink · 2008-07-18 13:29:57 ·

justin Australian join:1999-05-28 New York, NY kudos:7 Host: IPv6 Business Connectiv.. Console/Handheld g.. Home/Office setup .. Photos of Broadban..	said by macaholic: if you send this info to Apple maybe the fix will be included the next software update for the iPhone that brings it out of the beta program (i.e. rush this out fix it later). Like I've been told by so many here..it's probably your internet provider's implementation of routing. Maybe you can get your provider to update their hardware so the 3g can work properly. i guess you are being sarcastic but with both phones on the same connection to the same access point to the same server, any issue with ISP is eliminated.
	to forum · permalink · 2008-07-18 17:30:43 ·

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