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Application does not specify a receive buffer size Some applications may explicitly specify a receive buffer size, which would override the Windows default behavior . This can offer similar benefits on older versions of Windows, but changing the receive buffer size is uncommon . Application consumes data quickly after receiving them If an application does not immediately retrieve the received data, Receive Window Auto-Tuning may not increase overall performance . For example, if the application retrieves received data from TCP only periodically rather than continually, overall performance might not increase .

When TCP considers increasing the receive window size, it pays attention to the connection s past history and characteristics . TCP won t advertise more than the remote host s fair share of network bandwidth . This keeps the advertised receive window in line with the remote host s congestion window, discouraging network congestion while encouraging maximum utilization of the available bandwidth .

Keeping a Journal You can open a journal entry form (see Figure 18-2) and review details about an activity, or you can use the journal entry as a shortcut to go directly to the Outlook item or the file referred to in the journal entry. For example, if you created a contract as a Word document that is associated with a journal entry, you could open the contract through that entry rather than locating it in the My Computer or My Documents folder.

Note: One thread pool is created per process, so if you run several application domains within the same process, an error in one application domain can affect the rest within the same process because they use the same thread pool.

he ability to increase the receive window would be meaningless without window scaling. On its own, TCp allows a window size of only 64 KB. Operating

systems back through Windows Xp use this as their default value on fast links. The window scaling option is a way for window sizes to scale to megabytes and beyond. Starting with Windows Vista, window scaling is used by default. During connection establishment, use of the window scaling option is negotiated with the remote host. If supported by the remote side, window scaling is enabled on the connection. Windows Vista and Windows 7 use a scale factor of 8, which means that the advertised receive window value should be multiplied by 256. Therefore, Receive Window auto-Tuning uses a maximum receive window size of 16 MB.

The Windows Vista and Windows 7 TCP/IP stacks support the following RFCs to optimize throughput in high-loss environments:

RFC 2582: The NewReno Modification to TCP s Fast Recovery Algorithm The NewReno algorithm provides faster throughput by changing the way that a sender can increase the sending rate when multiple segments in a window of data are lost and

Figure 18-2. The journal entry form contains many fields to help you organize, store, and find your journal entries.

the sender receives a partial acknowledgment (an acknowledgment for only part of the data that is successfully received) . You can find this RFC at http://www.ietf.org/rfc /rfc2582.txt .

RFC 2883: An Extension to the Selective Acknowledgment (SACK) Option for TCP SACK, defined in RFC 2018, allows a receiver to indicate up to four noncontiguous blocks of received data . RFC 2883 defines an additional use of the fields in the SACK TCP option to acknowledge duplicate packets . This allows the receiver of the TCP segment containing the SACK option to determine when it has retransmitted a segment unnecessarily and adjust its behavior to prevent future retransmissions . The fewer retransmissions sent, the better the overall throughput . You can find this RFC at http://www.ietf.org/rfc/rfc2883.txt . RFC 3168: The Addition of Explicit Congestion Notification (ECN) to IP If a packet is lost in a TCP session, TCP assumes that it is caused by network congestion . In an attempt to alleviate the source of the problem, TCP lowers the sender s transmission rate . With ECN support on both TCP peers and in the routing infrastructure, routers experiencing congestion mark the packets as they forward them . This enables computers to lower their transmission rate before packet loss occurs, increasing the throughput . Windows Vista and Windows 7 support ECN, but it is disabled by default . You can enable ECN support with the following command .