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This is the tcpdump taken from the client. Client - 10.10.8.166 Server - 10.10.7.123 I am trying to hit a ssl url from the client. However the turn around time ...
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  1. #1
    Just Joined!
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    Feb 2007
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    Urgent help on Linux SSL performance


    This is the tcpdump taken from the client.

    Client - 10.10.8.166
    Server - 10.10.7.123

    I am trying to hit a ssl url from the client. However the turn around time is very large. And looking at the tcpdump, its mostly waiting on ack from the server. tcp_window_scaling is set to 0 in both server and client.

    Can anyone see anything wrong/obvious from this log. Please let me know if you need more details.

    t@sgi bin]# tcpdump host 10.10.7.123
    tcpdump: WARNING: eth0: no IPv4 address assigned
    tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
    listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
    15:29:08.706968 IP 10.10.8.166.1307 > 10.10.7.123.https: S 940144769:940144769(0) win 5840 <mss 1460,sackOK,timestamp 171698647 0>
    15:29:08.707165 IP 10.10.7.123.https > 10.10.8.166.1307: S 1537522948:1537522948(0) ack 940144770 win 5792 <mss 1460,sackOK,timestamp 915651 171698647>
    15:29:08.707185 IP 10.10.8.166.1307 > 10.10.7.123.https: . ack 1 win 5840 <nop,nop,timestamp 171698647 915651>
    15:29:08.707718 IP 10.10.8.166.1307 > 10.10.7.123.https: P 1:101(100) ack 1 win 5840 <nop,nop,timestamp 171698648 915651>
    15:29:08.707916 IP 10.10.7.123.https > 10.10.8.166.1307: . ack 101 win 5792 <nop,nop,timestamp 915651 171698648>
    15:29:08.708413 IP 10.10.7.123.https > 10.10.8.166.1307: P 1:664(663) ack 101 win 5792 <nop,nop,timestamp 915651 171698648>
    15:29:08.708420 IP 10.10.8.166.1307 > 10.10.7.123.https: . ack 664 win 6630 <nop,nop,timestamp 171698649 915651>
    15:29:08.709343 IP 10.10.8.166.1307 > 10.10.7.123.https: P 101:176(75) ack 664 win 6630 <nop,nop,timestamp 171698650 915651>
    15:29:08.709649 IP 10.10.8.166.1307 > 10.10.7.123.https: P 176:182(6) ack 664 win 6630 <nop,nop,timestamp 171698650 915651>
    15:29:08.739525 IP 10.10.7.123.https > 10.10.8.166.1307: . ack 182 win 5792 <nop,nop,timestamp 915655 171698650>

    15:29:08.739536 IP 10.10.8.166.1307 > 10.10.7.123.https: P 182:219(37) ack 664 win 6630 <nop,nop,timestamp 171698680 915655>
    15:29:08.739652 IP 10.10.7.123.https > 10.10.8.166.1307: . ack 219 win 5792 <nop,nop,timestamp 915655 171698680>
    15:29:08.740150 IP 10.10.7.123.https > 10.10.8.166.1307: P 664:707(43) ack 219 win 5792 <nop,nop,timestamp 915655 171698680>
    15:29:08.740461 IP 10.10.8.166.1307 > 10.10.7.123.https: P 219:390(171) ack 707 win 6630 <nop,nop,timestamp 171698681 915655>
    15:29:08.740622 IP 10.10.8.166.1307 > 10.10.7.123.https: . 390:1838(144 ack 707 win 6630 <nop,nop,timestamp 171698681 915655>
    15:29:08.740631 IP 10.10.8.166.1307 > 10.10.7.123.https: . 1838:3286(144 ack 707 win 6630 <nop,nop,timestamp 171698681 915655>
    15:29:08.740899 IP 10.10.7.123.https > 10.10.8.166.1307: . ack 1838 win 8688 <nop,nop,timestamp 915655 171698681>
    15:29:08.740911 IP 10.10.8.166.1307 > 10.10.7.123.https: P 3286:4734(144 ack 707 win 6630 <nop,nop,timestamp 171698681 915655>
    15:29:08.740917 IP 10.10.8.166.1307 > 10.10.7.123.https: P 4734:4754(20) ack 707 win 6630 <nop,nop,timestamp 171698681 915655>
    15:29:08.741149 IP 10.10.7.123.https > 10.10.8.166.1307: . ack 4734 win 14480 <nop,nop,timestamp 915655 171698681>
    15:29:08.744399 IP 10.10.7.123.https > 10.10.8.166.1307: P 707:894(187) ack 4754 win 14480 <nop,nop,timestamp 915655 171698681>
    15:29:08.744524 IP 10.10.7.123.https > 10.10.8.166.1307: . 894:2342(144 ack 4754 win 14480 <nop,nop,timestamp 915655 171698681>
    15:29:08.744530 IP 10.10.8.166.1307 > 10.10.7.123.https: . ack 2342 win 10136 <nop,nop,timestamp 171698685 915655>
    15:29:08.744649 IP 10.10.7.123.https > 10.10.8.166.1307: P 2342:2431(89) ack 4754 win 14480 <nop,nop,timestamp 915655 171698685>
    15:29:08.744774 IP 10.10.7.123.https > 10.10.8.166.1307: P 2431:2454(23) ack 4754 win 14480 <nop,nop,timestamp 915655 171698685>
    15:29:08.744780 IP 10.10.7.123.https > 10.10.8.166.1307: F 2454:2454(0) ack 4754 win 14480 <nop,nop,timestamp 915655 171698685>
    15:29:08.744888 IP 10.10.8.166.1307 > 10.10.7.123.https: P 4754:4777(23) ack 2455 win 10136 <nop,nop,timestamp 171698685 915655>
    15:29:08.744919 IP 10.10.8.166.1307 > 10.10.7.123.https: R 4777:4777(0) ack 2455 win 10136 <nop,nop,timestamp 171698685 915655>
    15:29:08.746685 IP 10.10.8.166.1308 > 10.10.7.123.https: S 930351682:930351682(0) win 5840 <mss 1460,sackOK,timestamp 171698687 0>
    15:29:08.746896 IP 10.10.7.123.https > 10.10.8.166.1308: S 1536956705:1536956705(0) ack 930351683 win 5792 <mss 1460,sackOK,timestamp 915655 171698687>
    15:29:08.746908 IP 10.10.8.166.1308 > 10.10.7.123.https: . ack 1 win 5840

  2. #2
    Just Joined!
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    Due to posting limit here, I have pasted only one message flow here. The delay I have highlighted in bold letters are consistently reproduce able.

    ~Rajesh.B

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