AIX Fast Connect for AIX Version 3.1 Guide

Chapter 7. Fast Connect for AIX advanced functions 91

7.4 Send File API support

The Fast Connect for AIX server supports the TCP/IP Sendfile API

(application programming interface) support. This is an in-kernel network file

cache to improve TCP/IP performance.

Sendfile setting is done with the

net config command. You can use the

options shown in Table 3.

Table 3. net config command options

You can also set these parameters by modifying the configuration file,

/etc/cifs/cifsConfig.

There is one additional parameter in AIX that can be set to tune the Sendfile

API performance. It is set with the

no command (see Table 4).

Table 4. Sendfile API performance no command option

In the following example, we will enable the Sendfile API and reduce the

cache validation time to one minute (60 seconds).

Option Description

/send_file_api:0|1 Disable/enable the Sendfile API. Default value is 1.

/send_file_size:val Defines an SMB read size limit, where the server will use

the Sendfile API. If an SMB read size is greater than this

parameter value, Sendfile API will be used for this SMB

read operation. The default value is 4096.

/send_file_cache_size:val Defines an SMB read size limit where the server will cache

the file. If an SMB read size is smaller than this parameter’s

value, Sendfile API will cache the file. The default value is

1048576. Value 0 means that the Sendfile API will cache

any file.

Option Description

send_file_duration Specifies the cache validation duration for all the file

objects that the system call send_file accessed in the

Network Buffer Cache. This attribute is expressed in

seconds; the default is 300.

# net config /send_file_api:1

# no -o send_file_duration=60