Contact Center Networking: Offload, Receive Side Scaling and Chimney

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TCP/UDP/IP/Large Send/Large Receive/etc Offload tasks have been known to cause significant performance degradation as load increases on Windows 2003 and Windows 2008 servers running any Cisco Unified Contact Center software.
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TBA
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Cisco has released a number of field notices regarding these issues and steps to address the settings.
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Windows 2003:
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Here is the collated recommendations for Windows 2003 SP2 servers if they are part of a Contact Centre deployment.
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*NIC Device driver updated to latest version
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*KB948496 downloaded and installed and server rebooted
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*Disable RSS and TCP Offload in the network adapter driver, with these steps:
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*Click Start, click Run, type ncpa.cpl, and then click OK.
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*Right-click a network adapter object, and then click Properties.
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*Click Configure, and then click the Advanced tab.
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*In the Property list, click Receive Side Scaling, click Disable in the Value list, and then click OK.
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*In the Property list, click TCP/IP Offload (IPv4 Checksum Offload), click Disable in the Value list, and then click OK.
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*Repeat steps for Public and Private interfaces.
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*Check the registry to confirm settings applied after KB patch
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HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
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EnableTCPChimney = 0
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EnableRSS = 0
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EnableTCPA = 0
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*Add the following key in the registry to globally disable TCP Offload
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HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
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New dword DisableTaskOffload = 1
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*Reboot the server again and check settings in TCP
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These have shown to provide a significant improvment in buffering and latency issues across private network links.
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or Windows 2008, please check the following link for TCP offload settings.
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http://support.microsoft.com/kb/951037
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[[Category:Unified_Contact_Center_Enterprise]]
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Revision as of 15:44, 24 May 2012

TBA

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