Use the tcpwindowsize option to specify,
in kilobytes, the size you want to use for the TCP/IP sliding window
for your client node.
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 allows the sender to continue sending data and can improve
communication performance.
Syntax
>>-TCPWindowsize-- --window_size-------------------------------><
Parameters
- window_size
- Specifies the size, in kilobytes, to use for your client node
TCP/IP sliding window. The range of values is 0 through 2048. A value
of 0 allows Tivoli® Storage Manager to
use the operating system default TCP window size. Values from 1 to
2048 indicate that the window size is in the range of 1KB to 2MB.
For Mac OS X, the range of values is 1 through 128. If you specify
a value less than 1, the TCP window size defaults to 1. If you specify
a value greater than 2048, the TCP window size defaults to 2048.
Note: - The TCP window acts as a buffer on the network. It is not related
to the tcpbuffsize option, or to the send and receive
buffers allocated in client or server memory.
- 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.
- Depending on the operating system communication settings, your
system might not accept all values in the range of values.
- The tcpwindowsize option
overrides the operating system's default TCP/IP session send and receive
window sizes.
- window_size
- Specifies the size, in kilobytes, to use for your client node
TCP/IP sliding window. The range of values is 0 through 2048. A value
of 0 allows Tivoli Storage Manager to
use the operating system default TCP window size. Values from 1 to
2048 indicate that the window size is in the range of 1KB to 2MB.
The default is 63.If you specify a value less than 1, the TCP window
size defaults to 1. If you specify a value greater than 2048, the
TCP window size defaults to 2048.
Note: - The TCP window acts as a buffer on the network. It is not related
to the tcpbuffsize option, or to the send and receive
buffers allocated in client or server memory.
- 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.
- Depending on the operating system communication settings, your
system might not accept all values in the range of values.
- The tcpwindowsize option
overrides the operating system's default TCP/IP session send and receive
window sizes.
- Windows provides a larger
TCP receive window size when communicating with hosts that also provide
this support, known as RFC1323. In these environments, a value greater
than 63 can be useful.
Examples
- Options file:
- tcpwindowsize 63
- Command line:
- -tcpw=63
This option is valid only on the initial command
line. It is not valid in interactive mode.