From owner-freebsd-questions@FreeBSD.ORG Tue Jan 8 12:39:08 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id CDD4ADC for ; Tue, 8 Jan 2013 12:39:08 +0000 (UTC) (envelope-from deb.roy.jyoti@gmail.com) Received: from mail-wg0-f52.google.com (mail-wg0-f52.google.com [74.125.82.52]) by mx1.freebsd.org (Postfix) with ESMTP id 4032FE5A for ; Tue, 8 Jan 2013 12:39:08 +0000 (UTC) Received: by mail-wg0-f52.google.com with SMTP id 12so274079wgh.31 for ; Tue, 08 Jan 2013 04:39:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=vee38rXqkcuRUj1oJazE+Azf88Ru6PZ7vGycWe2+S+0=; b=sRXg4BEoA2aUAEXIwKfusS87dHXgcqGZ6/hV33meNcA6txmOI79dLjl387E35DuPe4 LiZCKCHt7D9KmqvU4wlWfrIG7J9N+O0ETK2eg5D6fje7rdBF3JFlsVn+GIgBiPRA4vtn nYOS5uooliPhfy5YtDL4QI6ipgSYfoRvS8kAQim3tBNPrPUxreSUW6omoorbpFYfBBKa SsovQSV9w9nZTgAw1GV/V/7mgJPkSD2Ebl6dMEK1ig8BaM0EdiOyknrqL276yCsrTuS7 lmkDNPxxDL9yI7dvbFdkMmtXdj20hTwLgRJx+rifPJhwtP+OHUNBFfXa1xNUrkZbStlG 7fbw== MIME-Version: 1.0 Received: by 10.180.19.99 with SMTP id d3mr14669593wie.4.1357648747212; Tue, 08 Jan 2013 04:39:07 -0800 (PST) Received: by 10.217.44.65 with HTTP; Tue, 8 Jan 2013 04:39:07 -0800 (PST) Date: Tue, 8 Jan 2013 18:09:07 +0530 Message-ID: Subject: Help to understand the behaviour of TCP-Cubic module in FreeBSD From: Debojyoti Roy To: freebsd-questions@freebsd.org Content-Type: multipart/mixed; boundary=bcaec53d5a9f4eb0e804d2c63b9e X-Content-Filtered-By: Mailman/MimeDel 2.1.14 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Jan 2013 12:39:08 -0000 --bcaec53d5a9f4eb0e804d2c63b9e Content-Type: text/plain; charset=ISO-8859-1 Hi Everyone, I am trying to develop TCP-CUBIC and using Free-BSD as a standard device for testing. To load the Cubic module in FreeBSD the following commands were executed : kldload ./cc_cubic.ko sysctl -w net.inet.tcp.cc.algorithm=cubic The test method has been attached which was used to understand the behaviour of TCP-Cubic. There are few questions regarding the behaviour of FreeBSD. Q1) After receiving Full Acknowledgement from the receiver, sender entered into Congestion Avoidance State. At that moment filghtsize was equal to 0 and CWND became 1. Now, sender will increase its CWND according to CUBIC algorithm but FreeBSD follows Slow Start Algorithm by incrementing CWND from 1 --> 2 --> 4 segments. As per my understanding, if FreeBSD follows TCP-Cubic functionality, it should be in TCP friendly region. So, CWND should be 7 in next RTT. Calculation has been provided below : *W_tcp(t) = W_Max * (1 - beta) + 3 * beta/(2 - beta) * t/RTT* *=> W_tcp(t) = 7 * *[W_Max = 8, congestion occurs = 18.874sec , current time = 18.878sec, therefore elapsed time t = 0.004 sec, RTT = (18.878 - 18.876) = 0.002 sec, beta = 0.2]* But I find that it incremented to 2 rather than 7. Could you please explain this behaviour ? Q2) If my tool acknowledges all the packets coming from FreeBSD after Fast Retransmit, the segment sequence was 1 --> 2 --> 4 --> 5 --> 6 --> 7 --> 8 --> 6 --> 6 --> 6... Why after sending 8 segments in congestion avoidance state, CWND unexpectedly sets to 6 ? Q3) What will be the unit of t and RTT (i.e seconds or miliseconds) ? Q4) In Cubic-draft both concave and convex use the same formula. Only difference in convex it depends on max_increment_rate. How does max_increment_rate variable can be calculated ? If I have any wrong understanding please rectify me and I will be very grateful if you could answer the questions as soon as possible. Thanks in advance, Debojyoti Roy --bcaec53d5a9f4eb0e804d2c63b9e Content-Type: text/plain; charset=US-ASCII; name="tcp-cubic-test-method.txt" Content-Disposition: attachment; filename="tcp-cubic-test-method.txt" Content-Transfer-Encoding: base64 X-Attachment-Id: f_hboz4kir0 VGhlIGZvbGxvd2luZyBtZXRob2QgaGFzIGJlZW4gdXNlZCB0byB0ZXN0IHRoZSBDdWJpYyBpbiBj b25nZXN0aW9uIGF2b2lkYW5jZSBzdGF0ZSA6IA0KDQorKysrKysrKysrKysrKysrKysrKysrKysr KysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysr KysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysr KysrKysrKysrKysrKysrKysrKysrKysrKysNCnwgVGVzdCAJCUFjdGlvbiBpbgkJCQkJCQkJCQkJ CQkJCQkJICAgIHwNCnwgU3RlcCBOby4JdGhlIHN0ZXAJCQkJCQkJQ29tbWVudHMJCQkJCQkJCQkg ICAgfA0KKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysr KysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysr KysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysr 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