Tivoli Storage Manager for Sun Solaris Administrator's Reference

TCPWINDOWSIZE

Specifies, in kilobytes, the amount of receive data that can be buffered at one time on a TCP/IP connection. The sending host cannot send more data until it receives an acknowledgment and a TCP receive window update. Each TCP packet contains the advertised TCP receive window on the connection. A larger window lets the sender continue sending data, and may improve communication performance, especially on fast networks with high latency.

Notes:

  1. To improve backup performance, increase the TCPWINDOWSIZE on the server. To improve restore performance, increase the TCPWINDOWSIZE on the client.

  2. The TCP window acts as a buffer on the network. It is not related to the TCPBUFFSIZE option nor to the send and receive buffers allocated in client or server memory.

  3. A window size larger than the buffer space on the network adapter might degrade throughput due to resending packets that were lost on the adapter.

Syntax

>>-TCPWindowsize--kilobytes------------------------------------><
 

Parameters

kilobytes
Specifies the size you want to use, in kilobytes, for the TCP/IP sliding window for your client node. You can specify a value from 0 to 2048. Values from 1 to 2048 indicate that the window size is in the range of 1K to 2M.

Examples

tcpwindowsize 8


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