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Date: Tue, 15 Apr 2008 10:45:27 -0500 From: Wenji Wu <wenji@...l.gov> To: John Heffner <johnwheffner@...il.com> Cc: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>, Netdev <netdev@...r.kernel.org> Subject: Re: RE: A Linux TCP SACK Question > Sill the mystery remains as to why *both* are going so slowly. You > mentioned you're using a web100 kernel. What are the final values of > all the variables for the connections (grab with readall)? Kernel 2.6.24, "echo 1 > /proc/sys/net/ipv4/tcp_no_metrics_save" With SACK off: Throughtpu 256Mbps Connection 6 (198.2.1.2 38054 131.225.2.16 5001) State 1 SACKEnabled 0 TimestampsEnabled 1 NagleEnabled 1 ECNEnabled 0 SndWinScale 11 RcvWinScale 7 ActiveOpen 1 MSSRcvd 0 WinScaleRcvd 11 WinScaleSent 7 PktsOut 221715 DataPktsOut 221715 DataBytesOut 324429992 PktsIn 215245 DataPktsIn 0 DataBytesIn 0 SndUna 2784091744 SndNxt 2784091744 SndMax 2784091744 ThruBytesAcked 321011738 SndISS 2463080006 RcvNxt 1309516114 ThruBytesReceived 0 RecvISS 1309516114 StartTimeSec 1208273537 StartTimeUsec 293029 Duration 14594853 SndLimTransSender 6 SndLimBytesSender 23960 SndLimTimeSender 4137 SndLimTransCwnd 5 SndLimBytesCwnd 324406032 SndLimTimeCwnd 10046308 SndLimTransRwin 0 SndLimBytesRwin 0 SndLimTimeRwin 0 SlowStart 0 CongAvoid 0 CongestionSignals 4 OtherReductions 13167 X_OtherReductionsCV 0 X_OtherReductionsCM 13167 CongestionOverCount 54 CurCwnd 4344 MaxCwnd 173760 CurSsthresh 94894680 LimCwnd 4294965848 MaxSsthresh 94894680 MinSsthresh 4344 FastRetran 4 Timeouts 0 SubsequentTimeouts 0 CurTimeoutCount 0 AbruptTimeouts 0 PktsRetrans 17 BytesRetrans 24616 DupAcksIn 59556 SACKsRcvd 0 SACKBlocksRcvd 0 PreCongSumCwnd 375032 PreCongSumRTT 12 PostCongSumRTT 15 PostCongCountRTT 4 ECERcvd 0 SendStall 0 QuenchRcvd 0 RetranThresh 29 NonRecovDA 0 AckAfterFR 0 DSACKDups 0 SampleRTT 3 SmoothedRTT 3 RTTVar 50 MaxRTT 46 MinRTT 2 SumRTT 158191 CountRTT 47830 CurRTO 203 MaxRTO 237 MinRTO 203 CurMSS 1448 MaxMSS 1448 MinMSS 524 X_Sndbuf 1919232 X_Rcvbuf 87380 CurRetxQueue 0 MaxRetxQueue 0 CurAppWQueue 1786832 MaxAppWQueue 1886744 CurRwinSent 5888 MaxRwinSent 5888 MinRwinSent 5840 LimRwin 0 DupAcksOut 0 CurReasmQueue 0 MaxReasmQueue 0 CurAppRQueue 0 MaxAppRQueue 0 X_rcv_ssthresh 5840 X_wnd_clamp 64087 X_dbg1 5888 X_dbg2 536 X_dbg3 5840 X_dbg4 0 CurRwinRcvd 3137536 MaxRwinRcvd 3137536 MinRwinRcvd 17896 LocalAddressType 1 LocalAddress 198.2.1.2 LocalPort 38054 RemAddress 131.225.2.16 RemPort 5001 X_RcvRTT 0 ............................................................... With SACK On Throughput: 178Mbps Connection 3 (131.225.2.22 22 131.225.82.152 52973) State 5 SACKEnabled 3 TimestampsEnabled 1 NagleEnabled 0 ECNEnabled 0 SndWinScale 11 RcvWinScale 7 ActiveOpen 0 MSSRcvd 0 WinScaleRcvd 11 WinScaleSent 7 PktsOut 230 DataPktsOut 230 DataBytesOut 25783 PktsIn 353 DataPktsIn 164 DataBytesIn 11120 SndUna 2809669838 SndNxt 2809669838 SndMax 2809669838 ThruBytesAcked 18423 SndISS 2809651415 RcvNxt 2817947310 ThruBytesReceived 11120 RecvISS 2817936190 StartTimeSec 1208271915 StartTimeUsec 71844 Duration 2362591841 SndLimTransSender 6 SndLimBytesSender 25783 SndLimTimeSender 2273927770 SndLimTransCwnd 5 SndLimBytesCwnd 0 SndLimTimeCwnd 1047 SndLimTransRwin 0 SndLimBytesRwin 0 SndLimTimeRwin 0 SlowStart 0 CongAvoid 0 CongestionSignals 0 OtherReductions 0 X_OtherReductionsCV 0 X_OtherReductionsCM 0 CongestionOverCount 0 CurCwnd 5792 MaxCwnd 13032 CurSsthresh 4294966376 LimCwnd 4294965848 MaxSsthresh 0 MinSsthresh 4294967295 FastRetran 0 Timeouts 0 SubsequentTimeouts 0 CurTimeoutCount 0 AbruptTimeouts 0 PktsRetrans 0 BytesRetrans 0 DupAcksIn 0 SACKsRcvd 0 SACKBlocksRcvd 0 PreCongSumCwnd 0 PreCongSumRTT 0 PostCongSumRTT 0 PostCongCountRTT 0 ECERcvd 0 SendStall 0 QuenchRcvd 0 RetranThresh 3 NonRecovDA 0 AckAfterFR 0 DSACKDups 0 SampleRTT 0 SmoothedRTT 3 RTTVar 50 MaxRTT 40 MinRTT 0 SumRTT 1269 CountRTT 221 CurRTO 203 MaxRTO 234 MinRTO 201 CurMSS 1448 MaxMSS 1448 MinMSS 1428 X_Sndbuf 16384 X_Rcvbuf 87380 CurRetxQueue 0 MaxRetxQueue 0 CurAppWQueue 0 MaxAppWQueue 0 CurRwinSent 14208 MaxRwinSent 14208 MinRwinSent 5792 LimRwin 8365440 DupAcksOut 0 CurReasmQueue 0 MaxReasmQueue 0 CurAppRQueue 0 MaxAppRQueue 1152 X_rcv_ssthresh 14144 X_wnd_clamp 64087 X_dbg1 14208 X_dbg2 1152 X_dbg3 14144 X_dbg4 0 CurRwinRcvd 3749888 MaxRwinRcvd 3749888 MinRwinRcvd 3747840 LocalAddressType 1 LocalAddress 131.225.2.22 LocalPort 22 RemAddress 131.225.82.152 RemPort 52973 X_RcvRTT 405000 .................................................................. wenji -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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