Q-Logic 8100 SERIES manual Disable RSS Per Port, Header Data Split HDS

6–Configuring NIC Functionality in the Converged Network Adapter Configuring the NIC in a Windows Environment

Disabling RSS per Port Using the Windows Advanced Property Pages To disable RSS per port using the Windows Advanced Property pages (Figure 6-9):

1.Select ReceiveSideScaling under the Property box in the Advanced tab and set the value to Disabled.

2.Click OK to save the setting and deactivate RSS.

Figure 6-9. Disable RSS Per Port

For more information about Microsoft implementation of RSS and its limitations for Microsoft Windows operating system versions, refer to http://technet.microsoft.com/en-us/network/dd277646.aspx

Header Data Split (HDS)

Header data split (HDS) is a feature of the networking stack in Microsoft Windows Server 2008 and is fully supported by the QLogic 8100 Series Adapter NIC driver. HDS enables the adapter NDIS miniport driver to indicate to the network stack that incoming packets are split: the header portion of the packet and the data payload portion of the packet are mapped into two or more memory descriptor lists. The headers and the remainder of the payload are located in different areas in virtual memory, instead of in one contiguous virtual memory block. This split of the header and the data portions of the packets into multiple memory descriptor lists increases system performance, and reduces CPU use through intelligent cache management.

You should enable HDS in Microsoft Windows virtualized environments like Hyper-V.

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