Netscape DIRECTORY SERVER 6.1 Installation Manual page 39

while it waits for additional control blocks to be created. By increasing the TCB
timewait table size, you reduce latency overhead by allowing more client
connections to be serviced faster. To adjust this value, add to the following
registry key:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Param
eters
the value of
MaxFreeTcbs
This example increases the TCB timewait table to 4,000 entries from the default
of 2,000. Now that the overhead time introduced by TCP has been lowered for
Directory Server, adjust the corresponding hash table that stores the TCBs.
Adjust the hash table by adding to the following registry value:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Param
eters
the value of
MaxHashTableSize
This increases the TCB hash table size from 512 to 1,024, allowing more room
for connection information. TCB information is stored in the nonpaged
memory pool. If Directory Server is experiencing memory bottlenecks and
more memory cannot be allotted to the server, lower the above values.
On a multiprocessor system, we recommend optimizing the NIC and CPU
relationship. Each LDAP request received over the network generates an
interrupt to the processor requesting service. If the processor does not consider
the request to be sufficiently urgent, (that is, with a sufficiently high interrupt
level), it defers the request. This deferred interrupt request becomes a Deferred
Procedure Call (DPC). As more and more requests come into the server, the
number of interrupts and DPCs increases.
When an interrupt is sent to a particular CPU and is subsequently deferred,
additional server overhead is incurred if this DPC is shipped off to another
CPU in the server (if the server is an SMP capable machine). This is NTs default
behavior and can be costly from a performance perspective. To stop this
transfer from happening, add to the following registry value:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NDIS\Parame
ters
the value of
ProcessorAffinityMask
This forces the CPU that handled the interrupt to also handle any associated
DPCs. This also insures that the network interface card or cards are not to
associated with a specific CPU. This improves the CPUs servicing of interrupts
and DPCs generated by the network interface card(s).
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Chapter 2
Operating System Requirements
Computer System Requirements 39