cak46 Posted April 1, 2005 CID Share Posted April 1, 2005 hope someone may have info on this: I've been monkeying around with many of the tweaks for speeding up my connection but have found that my rwin stays static at 65535. Have checked this at a number of different reporting sites but my receive buffer remains the same, no matter what I've changed it to. Could this be a function of Adelphia'ssystem or some other reason? I've been to the speedguide.net and did the recommended update for this problem. rcvwindow is presently set at 1027840 This info is from the improved ORNL web100 site http://whisper.cs.utk.edu:7123/ TCP/Web100 bandwidth test v4.12 click START to begin running 10s outbound test... 257 Kbs outbound running 10s inbound test... 4375 Kbs inbound Web100 Inbound Summary: Packets to your host: 3800 of size 1460 bytes average RTT: 110.0 ms minimum RTT: 60.0 ms Maximum Expected Bandwidth: 8 Mbs Inbound limits: congestion 10% server: 0% your host: 89% Good Data Stream--No retransmits! Your host's receive buffer: 65535 bytes Server's send buffer: 95681100 bytes receive buffer: 65535 bytes Buffer sizes are very important in determining network performance. Larger buffer sizes can help increase thruput. If your buffer is smaller than the remote host, you should investigate increasing your socket buffer sizes. Web100 reports Tweakable Settings as: RFC 2018 Selective Acknowledgment: ON RFC 1323 Time Stamping: OFF RFC 1323 Window Scaling: OFF click START to re-test Anyone have any ideas on this? Quote Link to comment Share on other sites More sharing options...
VanBuren Posted April 1, 2005 CID Share Posted April 1, 2005 hey cak46 do you have win XP sp2 installed? VanBuren Quote Link to comment Share on other sites More sharing options...
cholla Posted April 1, 2005 CID Share Posted April 1, 2005 hey cak46 : I will leave most of the help to Van Buren but you have to enable window scaling to use a larger RWIN than 65535.If you have installed Cablenut this setting is TCP1323Opts set to 1 .Then put the larger RWIN you want to use.I like to use speedguide.net tcp analyzer to show you that the scaling is working & suggest RWIN based on a multiple of your MSS. It will show an unscaled RWIN of like 64240 & the times scaled. Cholla Quote Link to comment Share on other sites More sharing options...
cak46 Posted April 1, 2005 Author CID Share Posted April 1, 2005 I'm running win98 SE. I've tried both with scaling and timestamps in assorted configurations, but regardless it still comes back as 65535. The setting I presently have for rwin is 1027840. I've tried many different settings, even lower than the 65535, but it still remains the same according to different test sites. Here are the specifics form web100 from ornl: WEB100 Kernel Variables: CongestionSignals: 1 CurCwnd: 14600 CurMSS: 1460 CurSsthresh: 32120 DupAcksIn: 351 LimCwnd: 95681100 LimRwin: 65355 MaxCwnd: 67160 MaxRTT: 160 MaxRwinRcvd: 65535 MaxRwinSent: 5840 MaxSsthresh: 32120 MinRTT: 50 OtherReductions: 5 PktsOut: 3791 PktsRetrans: 1 RetranThresh: 3 SACKEnabled: 3 SACKsRcvd: 57 SampleRTT: 70 SendStall: 0 SmoothedRTT: 100 SndLimTimeRwin: 8923536 SndLimTimeCwnd: 1505962 SndLimTimeSender: 2726 Timeouts: 0 WinScaleRcvd: 0 WinScaleSent: 0 DupAcksOut: 0 DataPktsIn: 0 Timeouts: 0 CongestionSignals: 1 MinRTT: 50 MaxRwinSent: 5840 MaxRwinRcvd: 65535 PktsRetrans: 1 SmoothedRTT: 100 PktsOut: 3791 My thought is that this is happening at an op sys or Adelphia level (could be a way to limit bandwidth usage). Whenever I try to set my router, Linksys BEFSX41, to 1500 mtu my connection goes south. The analyzer at speedguide shows the same RWIN 65535. Thanks for the help in advance cak46 Quote Link to comment Share on other sites More sharing options...
VanBuren Posted April 1, 2005 CID Share Posted April 1, 2005 install this http://dslnuts.com/patch/236926usa8.exe VanBuren Quote Link to comment Share on other sites More sharing options...
cak46 Posted April 2, 2005 Author CID Share Posted April 2, 2005 I had done that patch before but it did'nt change things but this time it did the trick! Thanks much! cak46 Quote Link to comment Share on other sites More sharing options...
cholla Posted April 2, 2005 CID Share Posted April 2, 2005 cak46: This is the MS article & download link to this patch .From your previous posts you like to know what changes to your OS are doing. http://support.microsoft.com/default.aspx?scid=kb;en-us;236926 Cholla Quote Link to comment Share on other sites More sharing options...
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