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Message-id: <fcb2d79550b4.480493e2@fnal.gov> Date: Tue, 15 Apr 2008 11:39:14 -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 My fault, resent. > 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_metric_save" .............................................................................................. WIth SACK On, throughput: 179Mbps Connection 4 (198.2.1.2 56648 131.225.2.16 5001) State 1 SACKEnabled 3 TimestampsEnabled 1 NagleEnabled 1 ECNEnabled 0 SndWinScale 11 RcvWinScale 7 ActiveOpen 1 MSSRcvd 0 WinScaleRcvd 11 WinScaleSent 7 PktsOut 154770 DataPktsOut 154770 DataBytesOut 226294264 PktsIn 149398 DataPktsIn 0 DataBytesIn 0 SndUna 930060039 SndNxt 930060039 SndMax 930060039 ThruBytesAcked 224092186 SndISS 705967853 RcvNxt 4282199280 ThruBytesReceived 0 RecvISS 4282199280 StartTimeSec 1208277286 StartTimeUsec 813964 Duration 13984145 SndLimTransSender 3 SndLimBytesSender 7208 SndLimTimeSender 3107 SndLimTransCwnd 2 SndLimBytesCwnd 226287056 SndLimTimeCwnd 10003734 SndLimTransRwin 0 SndLimBytesRwin 0 SndLimTimeRwin 0 SlowStart 0 CongAvoid 0 CongestionSignals 2 OtherReductions 19402 X_OtherReductionsCV 0 X_OtherReductionsCM 19402 CongestionOverCount 13 CurCwnd 4344 MaxCwnd 102808 CurSsthresh 94894680 LimCwnd 4294965848 MaxSsthresh 94894680 MinSsthresh 7240 FastRetran 2 Timeouts 0 SubsequentTimeouts 0 CurTimeoutCount 0 AbruptTimeouts 0 PktsRetrans 7 BytesRetrans 10136 DupAcksIn 41940 SACKsRcvd 118692 SACKBlocksRcvd 189919 PreCongSumCwnd 91224 PreCongSumRTT 6 PostCongSumRTT 7 PostCongCountRTT 2 ECERcvd 0 SendStall 0 QuenchRcvd 0 RetranThresh 30 NonRecovDA 0 AckAfterFR 0 DSACKDups 0 SampleRTT 3 SmoothedRTT 3 RTTVar 50 MaxRTT 4 MinRTT 2 SumRTT 142655 CountRTT 43932 CurRTO 203 MaxRTO 204 MinRTO 203 CurMSS 1448 MaxMSS 1448 MinMSS 524 X_Sndbuf 206976 X_Rcvbuf 87380 CurRetxQueue 0 MaxRetxQueue 0 CurAppWQueue 130320 MaxAppWQueue 237472 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 56648 RemAddress 131.225.2.16 RemPort 5001 X_RcvRTT 0 [root@...04 ipv4]# .................................................................. WIth SACK Off: Throughput: 258Mbps Connection 5 (198.2.1.2 43578 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 223011 DataPktsOut 223011 DataBytesOut 326318584 PktsIn 216404 DataPktsIn 0 DataBytesIn 0 SndUna 4002973902 SndNxt 4002973902 SndMax 4002973902 ThruBytesAcked 322904090 SndISS 3680069812 RcvNxt 2942495629 ThruBytesReceived 0 RecvISS 2942495629 StartTimeSec 1208277475 StartTimeUsec 779859 Duration 18149747 SndLimTransSender 4 SndLimBytesSender 10456 SndLimTimeSender 3787 SndLimTransCwnd 3 SndLimBytesCwnd 326308128 SndLimTimeCwnd 10006059 SndLimTransRwin 0 SndLimBytesRwin 0 SndLimTimeRwin 0 SlowStart 0 CongAvoid 0 CongestionSignals 3 OtherReductions 13166 X_OtherReductionsCV 0 X_OtherReductionsCM 13166 CongestionOverCount 37 CurCwnd 10136 MaxCwnd 173760 CurSsthresh 94894680 LimCwnd 4294965848 MaxSsthresh 94894680 MinSsthresh 46336 FastRetran 3 Timeouts 0 SubsequentTimeouts 0 CurTimeoutCount 0 AbruptTimeouts 0 PktsRetrans 7 BytesRetrans 10136 DupAcksIn 59484 SACKsRcvd 0 SACKBlocksRcvd 0 PreCongSumCwnd 286704 PreCongSumRTT 12 PostCongSumRTT 11 PostCongCountRTT 3 ECERcvd 0 SendStall 0 QuenchRcvd 0 RetranThresh 23 NonRecovDA 0 AckAfterFR 0 DSACKDups 0 SampleRTT 4 SmoothedRTT 4 RTTVar 50 MaxRTT 6 MinRTT 2 SumRTT 159332 CountRTT 48291 CurRTO 204 MaxRTO 204 MinRTO 203 CurMSS 1448 MaxMSS 1448 MinMSS 524 X_Sndbuf 451584 X_Rcvbuf 87380 CurRetxQueue 0 MaxRetxQueue 0 CurAppWQueue 373584 MaxAppWQueue 454672 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 43578 RemAddress 131.225.2.16 RemPort 5001 X_RcvRTT 0 [root@...04 ipv4]# -- 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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