nanog mailing list archives
TCP congestion
From: Philip Lavine <source_route () yahoo com>
Date: Thu, 12 Jul 2007 11:07:00 -0700 (PDT)
Can someone explain how a TCP conversation could degenerate into congestion avoidance on a long fat pipe if there is no packet/segment loss or out of order segments? Here is the situation: WAN = 9 Mbps ATM connection between NY and LA (70 ms delay) LAN = Gig Ethernet Receiver: LA server = Win2k3 Sender: NY server = Linux 2.4 Data transmission typical = bursty but never more that 50% of CIR Segment sizes = 64k to 1460k but mostly less than 100k Typical Problem Scenario: Data transmission is humming along consistently at 2 Mbps, all of a sudden transmission rates drop to nothing then pickup again after 15-20 seconds. Prior to the drop off (based on packet capture) there is usually a DUP ACK/SACK coming from the receiver followed by the Retransmits and congestion avoidence. What is strange is there is nothing prior to the drop off that would be an impetus for congestion (no high BW utilization or packet loss). Also is there any known TCP issues between linux 2.4 kernel and windows 2003 SP1? Mainly are there issues regarding the handling of SACK, DUP ACK's and Fast Retransmits. Of course we all know that this is not a application issue since developers make flawless socket code, but if it is network issue how is caused? Philip ____________________________________________________________________________________ Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos & more. http://mobile.yahoo.com/go?refer=1GNXIC
Current thread:
- TCP congestion Philip Lavine (Jul 12)
- RE: TCP congestion Brian Knoll (TTNET) (Jul 12)
- Re: TCP congestion Fred Baker (Jul 12)
- Re: TCP congestion Jared Mauch (Jul 12)
- Re: TCP congestion Valdis . Kletnieks (Jul 12)
- RE: TCP congestion michael.dillon (Jul 12)
- Re: TCP congestion Joe Loiacono (Jul 12)
- Re: TCP congestion Jay Hennigan (Jul 12)
- Re: TCP congestion Warren Kumari (Jul 13)
- <Possible follow-ups>
- Re: TCP congestion Philip Lavine (Jul 12)
- Re: TCP congestion Stephen Wilcox (Jul 12)
(Thread continues...)
- RE: TCP congestion Brian Knoll (TTNET) (Jul 12)