iTP Secure WebServer System Administrators Guide (Version 7.5+)

SK_GlobalCacheTimeout
Syntax
SK_GlobalCacheTimeout hundredths-of-seconds
Description
The SK_GlobalCacheTimeout directive can be used in conjunction with the SK_GlobalCache
directive. It specifies the amount of time that the httpd server should wait for a response from the
Global Session Key Cache server.
Default
SK_GlobalCacheTimeout 50
which assigns 5 seconds, measured in hundredths-of-seconds.
Example
SK_GlobalCacheTimeout 100
TCPNoDelay
Syntax
TCPNoDelay <ON/OFF>
Description
The TCPNoDelay option is used to disable Nagle's Algorithm during data transmission.
iTP Secure WebServer currently works in conjunction with Nagle's Algorithm and the TCP Delayed
Acknowledgements algorithm. At some point, the iTP Secure WebServer will need to send two
data buffers in a row, with the second one typically being less than the full-sized segment. If the
iTP Secure WebServer does not have the Nagle's Algorithm disabled on its socket, NonStop TCP/IP
sends a large packet first, and then waits for the acknowledgement from the client's TCP/IP before
sending the second smaller packet.
Because most of the client TCP/IPs uses the TCP Delayed Acknowledgements (Delayed ACK)
Algorithm, by default, with a delay timer of 200ms, it does not send an acknowledgement right
away for the initial large packet, but waits until its Delay-ACK timer expires. When that timer
expires, ACK is sent to NonStop TCP/IP and then iTP Secure WebServer sends the smaller packet.
Thus, there may be significant delay, of up to 500 milliseconds, when two successive write
operations are in progress. This issue is resolved by disabling the Nagle's algorithm using
TCPNoDelay configuration directive.
Default
TCPNoDelay OFF
By default, the value of this configuration directive is set to 'OFF' and iTP Secure WebServer will
transmit the data in accordance with Nagle's algorithm.
Examples
TCPNoDelay ON
CAUTION: This configuration directive must be used after completely understanding the Nagle's
Algorithm and TCP Delayed Acknowledgements options, and the data transfer requirements,
otherwise it may lead to performance issues.
SK_GlobalCacheTimeout 257