Table 15. Example Syntax for NTttcpSender and Receiver

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Table 15. Example Syntax for NTttcpSender and Receiver

Syntax	Details
Example Syntax for a Sender NTttcps –m 1,0,10.1.2.3 –a 2	Single thread Bound to CPU 0 Connecting to computer with IP 10.1.2.3 Posting two send overlapped buffers Default buffer size: 64 KB Default buffer number: 20 KB
Example Syntax for a Receiver NTttcpr –m 1,0,10.1.2.3 –a 6 –t 1000	Single thread Bound to CPU 0 Connecting to computer with IP 10.1.2.3 Posting two send overlapped buffers Default buffer size: 64 KB Default buffer number: 20 KB

Network Adapter

Make sure you enable all offloading features.

TCP

Set TcpWindowSize to something larger than the default value for Gigabit Ethernet (64 KB) only if you have a large bandwidth-delay product.

For example, using the Intel MT Gigabit card on a LAN, you would leave all network adapter and TCP settings at their default values for NTttcp.

The Intel MT network adapter offloads LSO and checksum (send as well as receive) by default.
The Intel MT network adapter adaptively manages its resources and you will not need to change any network adapter resource values.
Coalesce Buffers is not exposed, but the default interrupt moderation scheme works well.

Tuning for Chariot

Chariot is a networking workload generator from NetIQ. It stresses the network to help predict networked application performance.

The High_Performance_Throughput script workload of Chariot may be used to simulate the NTttcp workload. The tuning considerations for this workload would the same as those for NTttcp.

Table 15. Example Syntax for NTttcpSender and Receiver