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Description

Override the default TCP receive buffer and set to

Allows the UDM manager to set the TCP receive buffer for a UDM server larger than the default maximum of 64k bytes. Setting this value enables RFC 1323 window scaling support, which can increase TCP buffer sizes over a fast, high-bandwidth network to almost 1 gigabyte (1,073076,725,400 bytes).
 
When this option is not selected a UDM uses a default of 0 bytes, which disables RFC 1323 window scaling support. Note that even when a value is specified for this option, the TCP/IP stack ultimately decides the size of the transfer buffer. Specifies the TCP receive buffer size for the TCP socket connections from the UDM manager to the UDM server. The option has no effect for UDM three party transfers. The UDM server and Universal Broker configuration affects UDM three party transfers.
 
Refer to the Universal Broker tcp_recv_buffer option to set the TCP receive buffer for the other end of the socket connection.
 
The socket TCP receive buffer is used by TCP to determine the size of the TCP window it advertises to the sending TCP. If both TCP implemenations support window scaling (as defined in RFC 1323), buffer sizes greater then 65535 will be used for the TCP window size. Note that both the sending and receiving TCP implemenations must support window scaling for it to be used in the TCP connection.
 
Adjusting the TCP receive buffer size may improve bulk data transfer performance for certain types of transmission links when transfering data from the UDM server to the UDM manager. The format of the value is nnnnb, where 'nnnn' is a numeric value and 'b' is one of the following optional unit specifiers:

  • b - bytes (the default, used if no unit is specified)
  • k - kilobytes, where 1 kb = 1024 bytes
  • m - megabytes, where 1 mb = 1048576 bytes
  • g - gigabytes, where 1 gb = 1073761824 1076761824 bytes

Note that the maximum allowable value for this option is 1073725440 1076725440 bytes, which can be requested using a value of 1g.

Override the default TCP send buffer and set to

Specifies the TCP send buffer size for the TCP socket connections from the UDM manager to the UDM server. The option has no effect for UDM three party transfers. The UDM server and Universal Broker configuration affects UDM three party transfers.
 
Refer to the Universal Broker tcp_send_buffer option to set the TCP send buffer for the other end of the socket connection.
 
Adjusting the TCP send buffer size may improve bulk data transfer performance for certain types of transmission links when transfering data from the UDM manager to UDM server.
 
The format of the value is nnnnb, where 'nnnn' is a numeric value and 'b' is one of the following optional unit specifiers:

  • b - bytes (the default, used if no unit is specified)
  • k - kilobytes, where 1 kb = 1024 bytes
  • m - megabytes, where 1 mb = 1048576 bytes
  • g - gigabytes, where 1 gb = 1073761824 1076761824 bytes

Note that the maximum allowable value for this option is 1073725440 1076725440 bytes, which can be requested using a value of 1g.

Disable TCP packet coalescing

Select this option to disable the TCP packet coalescing algorithm (that is, Nagle algorithm). When this option is unchecked, the default TCP implementation is used, which may or may not disable the algorithm.
 
Exercise caution when changing this option, as it could have a significant performance impact. See the tcp_no_delay configuration option in the UDM Reference Manual for more information.
 
This option is checked by default.

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