TCP Congestion Control in Java

Drawing QR Code ISO/IEC18004 in Java TCP Congestion Control
TCP Congestion Control
QR Code ISO/IEC18004 Maker In Java
Using Barcode generator for Java Control to generate, create QR Code JIS X 0510 image in Java applications.
window's worth of segments, the server continues to transmit segments after having transmitted the first window's worth of segments And because the acknowledgements arrive periodically at the server every S/R seconds from the time when the first acknowledgement arrives, the server transmits segments continuously until it has transmitted the entire object Thus, once the server starts to transmit the object at rate R, it continues to transmit the object at rate R until the entire object is transmitted The latency therefore is 2 RTT + O/R Now let us consider Case 2, which is illustrated in Figure 37-6 In this figure, the window size is W=2 segments
Bar Code Generation In Java
Using Barcode encoder for Java Control to generate, create barcode image in Java applications.
Figure 37-6: the case that WS/R < RTT + S/R Once again, after a total of two RTTs the client begins to receive segments from the server These segments arrive peridodically every S/R seconds, and the client acknowledges every segment it receives from the server But now the server completes the transmission of the first window before the first acknowledgment arrives from the client Therefore, after sending a window, the server must stall and wait for an acknowledgement before resuming transmission When an acknowledgement finally arrives, the server sends a new segment to the client Once the first acknowledgement arrives, a window's worth of acknowledgements arrive, with each successive acknowledgement spaced by S/R seconds For each of these acknowledgements, the server sends exactly one segment Thus, the server alternates between two states: a transmitting state, during which it transmits W segments; and a stalled state, during which it transmits nothing and waits for an acknowledgement The latency is equal to 2 RTT plus the time required for the server to transmit the object, O/R, plus the amount of time that the server is in the stalled state To determine the amount of time the server is in the stalled state, let K = O/WS; if O/WS is not an integer, then round K up to the nearest integer Note that K is the number of windows of data there are in the object of size O The server is in the stalled state between the transmission of each of the windows, that is, for K-1 periods of time, with each period lasting RTT- (W-1)S/R (see above diagram) Thus, for Case 2, Latency = 2 RTT + O/R + (K-1)[S/R + RTT - W S/R] Combining the two cases, we obtain
Bar Code Decoder In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
file:///D|/Downloads/Livros/computa o/Computer%20Netw0Approach%20Featuring%20the%20Internet/congestionhtml (9 of 15)20/11/2004 15:52:14
QR Code 2d Barcode Creator In Visual C#.NET
Using Barcode generation for VS .NET Control to generate, create QR Code 2d barcode image in .NET applications.
TCP Congestion Control
QR Code Maker In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
Latency = 2 RTT + O/R + (K-1) [S/R + RTT - W S/R]+ where [x]+ = max(x,0) This completes our analysis of static windows The analysis below for dynamic windows is more complicated, but parallels the analysis for static windows
Painting QR In .NET
Using Barcode maker for .NET Control to generate, create Quick Response Code image in Visual Studio .NET applications.
373 Modeling Latency: Dynamic Congestion Window
QR Code JIS X 0510 Drawer In VB.NET
Using Barcode maker for .NET framework Control to generate, create QR image in .NET applications.
We now investigate the latency for a file transfer when TCP's dynamic congestion window is in force Recall that the server first starts with a congestion window of one segment and sends one segment to the client When it receives an acknowledgement for the segment, it increases its congestion window to two segments and sends two segments to the client (spaced apart by S/R seconds) As it receives the acknowledgements for the two segments, it increases the congestion window to four segments and sends four segments to the client (again spaced apart by S/R seconds) The process continues, with the congestion window doubling every RTT A timing diagram for TCP is illustrated in Figure 37-7
EAN 128 Creation In Java
Using Barcode generator for Java Control to generate, create UCC - 12 image in Java applications.
file:///D|/Downloads/Livros/computa o/Computer%20NetApproach%20Featuring%20the%20Internet/congestionhtml (10 of 15)20/11/2004 15:52:15
Generate ANSI/AIM Code 128 In Java
Using Barcode drawer for Java Control to generate, create Code 128A image in Java applications.
TCP Congestion Control
Barcode Encoder In Java
Using Barcode printer for Java Control to generate, create bar code image in Java applications.
Figure 37-7: TCP timing during slow start Note that O/S is the number of segments in the object; in the above diagram, O/S =15 Consider the number of segments that are in each of the windows The first window contains 1 segment; the second window contains 2 segments; the third window contains 4 segments More generally, the kth window contains 2k-1 segments Let K be the number of windows that cover the object; in the preceding diagram K=4 In general we can express K in terms of O/S as follows:
UPC-A Supplement 2 Creation In Java
Using Barcode generator for Java Control to generate, create UPC-A Supplement 2 image in Java applications.
After transmitting a window's worth of data, the server may stall (ie, stop transmitting) while it waits for an acknowledgement In the preceding diagram, the server stalls after transmitting the first and second windows, but not after transmitting the third Let us now calculate the amount of stall time after transmitting the kth window The time from when the server begins to transmit the kth window until when the server receives an acknowledgement for the first segment in the window is S/R + RTT The transmission time of the kth window is (S/R) 2k-1 The stall time is the difference of these two quantities, that is, [S/R + RTT - 2k-1(S/R)]+ The server can potentially stall after the transmission of each of the first K-1 windows (The server is done after the transmission of the Kth window) We can now calculate the latency for transferring the file The latency has three components: 2RTT for setting up the TCP connection and requesting the file; O/R, the transmission time of the object; and the sum of all the stalled times Thus,
Paint ANSI/AIM Code 39 In Java
Using Barcode encoder for Java Control to generate, create Code-39 image in Java applications.
The reader should compare the above equation for the latency equation for static congestion windows; all the terms are exactly the same except the term WS/R for static windows has been replaced by 2k-1S/R for dynamic windows To obtain a more compact expression for the latency, let Q be the number of times the server would stall if the object contained an infinite number of segments:
Create ANSI/AIM ITF 25 In Java
Using Barcode maker for Java Control to generate, create 2 of 5 Interleaved image in Java applications.
file:///D|/Downloads/Livros/computa o/Computer%20NetApproach%20Featuring%20the%20Internet/congestionhtml (11 of 15)20/11/2004 15:52:15
Data Matrix 2d Barcode Generator In .NET Framework
Using Barcode creator for ASP.NET Control to generate, create Data Matrix ECC200 image in ASP.NET applications.
Barcode Generator In .NET
Using Barcode generation for .NET Control to generate, create barcode image in Visual Studio .NET applications.
Code 128C Decoder In .NET Framework
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET applications.
Code39 Generator In VS .NET
Using Barcode drawer for VS .NET Control to generate, create Code-39 image in VS .NET applications.