Why are Windows Server 2008 64 bit systems experiencing performance issues once Symantec Endpoint Protection is installed?
Symptoms Windows Server 2008 64 bit systems with a Broadcom BCM5708C NetXtreme II GigE network interface card installed show serious latency issues when Symantec Endpoint Protection (SEP) is installed. Once SEP is removed the latency issue disappears.
The Broadcom BCM5708C NetXtreme II GigE network interface card (nic) has a default setting for the IPv4 Large Send Offload property that is enabled and causes the latency issue when SEP is installed.
Changing the Value for IPv4 Large Send Offload property to Disable resolves the latency issue.
Follow these steps:
1. Right-click the Networks icon on the desktop (if you have it present, if not type ncpa.cpl in the Run menu) and select Properties.
2. In the Network and Sharing Center window, click on the
Manage network connections link on the left side.
3. Right-click on each Broadcom BCM5708C NetXtreme II GigE NIC icon and select Properties.
4. In each NIC Properties window, click on the Configure button.
5. Click on the Advanced tab.
6. In the Property field, locate and select the IPv4 Large Send Offload property. Then select Disable in the Value drop-down list.
Click OK. Your network connection may drop momentarily.
"Large Send Offload (LSO) is a feature provided by Broadcom network adapters that prevents an upper level protocol such as TCP from breaking a large data packet into a series of smaller packets with headers appended to them. The protocol stack need only generate a single header for a data packet as large as 64 KB, and the adapter hardware breaks the data buffer into appropriately-sized Ethernet frames with the correctly sequenced header (based on the single header originally provided)."
Imported Document ID: TECH96958
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