! KB 934809 – Throughput for an ISA that is running on a Windows Server 2003 SP2


Microsoft release a new KB for ISA Server w/ Windows Server SP2.

“You are using a Microsoft Windows Server 2003 Service Pack 2 (SP2)-based multiprocessor computer that is running Microsoft Internet Security and Acceleration (ISA) Server 2006 or Microsoft ISA Server 2004. With this configuration, you experience the following symptoms:

• CPU use for a particular processor reaches 100 percent.

• The total throughput of ISA Server is greatly reduced or completely blocked.

• Latency increases significantly even though other processors are used at much reduced levels.

Note This problem occurs only on multiprocessor computers that use 32-bit processors.

This problem occurs because of the “lazy Interrupt Request Level” (IRQL) handler that is included in Windows Server 2003 SP2.

To resolve this problem, use the Interrupt-Affinity tool to assign the interrupts of different network adapters to different processors. …” See link below.

Source: http://support.microsoft.com/default.aspx?scid=kb;en-us;934809


Eduardo Petizme
MVP Windows Server System – ISA Server
Site: http://www.petizme.com
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