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DHCP Server Performance Degraded by Large Number of Scopes

This article was previously published under Q182047
This article has been archived. It is offered "as is" and will no longer be updated.
SYMPTOMS
When a large number of scopes are configured on a Windows NT 4.0DHCP server, performance degrades to where it cannot keep up with largeclient loads such as those experienced after a power failure, or at peaknetwork startup times.
CAUSE
A list of scopes is maintained in the registry. When a DHCP DISCOVER orDHCP REQUEST is received, it must be matched against the configured scopesto see if the server is able to provide services to the client subnet. Thisprocess of searching through the scopes was not optimized for large numbersof scopes. Additionally, some database calls could experience suboptimalperformance caused by nonoptimal database buffer initialization.
RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack

NOTE: This hotfix supersedes the fixes referred to in the followingarticles in the Microsoft Knowledge Base:

ARTICLE-ID: 141496
TITLE : DHCP Client Comment Disappears When Obtaining IP Address

ARTICLE-ID: 167708
TITLE : BootP Client Names Disappear in DHCP Manager

ARTICLE-ID: 163055
TITLE : DHCP Client May Fail with WinNT 4.0 SP2 Multinetted DHCP Server

ARTICLE-ID: 175035
TITLE : Diskless Workstations Cannot Find BOOTP Server with DHCP
STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
MORE INFORMATION
The updated file caches the entire scope list in memory, and uses a binarysearch to quickly determine if the server has a scope that is relevant toeach client request. This update dramatically reduces the number of timesthat registry keys are opened and searched. It also provides more buffersfor interaction with the database, which improves database throughput.
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Properties

Article ID: 182047 - Last Review: 10/07/2013 21:00:10 - Revision: 1.3

Microsoft Windows NT Server 4.0, Terminal Server Edition, Microsoft Windows NT Workstation 4.0 Developer Edition, Microsoft Windows NT Server 4.0 Standard Edition

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