memory considerations for Active Directory

Location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters

Name: EDB max ver pages (increment over the minimum)
Type: REG_DWORD
Value:
Note The value for the setting is the number of 16KB memory chunks (or 32KB memory chunks on a 64-bit processor) that will be reserved. For example:
9600 = ~150 MB 32-bit, ~600 MB 64-bit
12800 = ~200 MB 32-bit, ~800 MB 64-bit
16000 = ~250 MB 32-bit, ~1000 MB 64-bit
19200 = ~300 MB 32-bit, ~1200 MB 64-bit

When to increase? When allocated buckets are on high values...

performance tunning for Active Directory

NTDS\Request Latency - should be as low as possible - at the end is the defined timeout - by default - 120 seconds, but we don't want to be there...
Number of LDAP threads - by default is 4 per cpu core, so in environment with 4 cores is 16 - so if we have current value of 16 and cpu use at 100% so maybe we have bottleneck? CPU queue is another sign of issues.
NTDS\Estimated Queue Delay - shoud be 0 - is higher we have a problem - querries are wainting to process