AS/U server performance is sensitive to client usage levels.
To improve performance from clients to AS/U servers, connections
are established with the TCP No Delay option. This option removes
a delay for certain SMB transactions.The registry values and lanman.ini
parameters are set to default levels that should be appropriate
for the average installation. Tuning individual parameters for specific
server usage can often improve performance. Two such parameters
that are sensitive to tuning are the registry value VCDistribution
and the lanman.ini parameter maxclients.
The default value for the registry value LockNapInMSec
is based on benchmark tuning. The optimal value for a particular
installation is workload-dependent and may require some experimentation
to determine.
Configuring NetBIOS Memory Usage |
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The configurable kernel parameter nrfc_nb allows you to specify the maximum number of
NetBIOS connections that will be in use on a system. This parameter
is used to tune the amount of memory used by NetBIOS.
Acceptable Values:
Minimum: 100
Maximum: 2048
Default: 1024
The number of connections is closely bound to the system memory
usage. More memory will be used when more connections are configured.
Too little memory will prevent NetBIOS from operating properly.
Therefore, unless it is needed, we do not recommend changing the
default value. Increase the value if you receive either of the following
NetBIOS warning messages on the console or syslog: the rfcnb warning
message "Resource map low" or "No resource
map available."
The value can be modified through SAM or by editing the /stand/system
file on the system. An error will be returned if the value is outside
the boundaries of the minimum and maximum values.
Batch Oplocks Performance |
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Batch
oplocks, used by Windows NT, are implemented in this release. Unlike
exclusive oplocks, which allowed a client
to open a file for exclusive access, batch
oplocks enable a client to repeatedly open and close a file without
forcing a remote server to physically open and close it. A client
can keep a file open until another client wants to modify it (for
example, to move the file, delete the file, get file information,
or set file information). This process more efficiently handles
DOS, which traditionally forces batch files to be opened and closed
each time a line is read.
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