Windows® 7 Network Tuning
Explain the auto tuning of TCP settings in Windows 7. Mention its features and common problems that may arise while using this option.
Networking hardware has improved over the last few years. Gigabit networking is becoming more and more complex and is being integrated with most computers. TCP sends data and the amount of data is dependent on certain factors such as the number of bytes available to send and the congestion and receive window. 64K bytes is the maximum data a Window might be able to receive. The receive window is often the limiting factor if the application is the main criteria in determining the speed of communication. High-bandwidth/high-latency networks are possible by adjusting the TCP settings in the computer. In this way the auto tuning of TCP settings in the Windows 7 computer increases network performance.
Following are the features of Network Tuning and the common problems that might arise while using it:
- Receive-Side Scaling
- TCP offload
- Fine tuning not possible
There are a number of challenges to be met with, while networking for multi-processor systems. To avoid packet reordering on previous versions of Windows, all packets indicated in a single interrupt service routine (ISR) are processed in a single deferred procedure call (DPC). This is queued to a specific processor. Packet processing on multiple processors at the same time is achieved by allowing ISRs to queue DPCs on multiple processors.
Offloads are created on the basis of per-connection. In addition to the offloads supported on previous Windows releases, support for TCP chimney offload is also introduced. TCP chimney offload further reduces networking-related CPU activity. This helps in achieving better performance of the computer. TCP chimney offload facilitates Windows to offload the entire TCP processing. By freeing up the CPU for other tasks, networking speed can be increased.
It may not be possible to configure every setting of the TCP in Windows 7 automatically. It can however be done manually. After installing the appropriate drivers, you might configure the Ethernet card. Make sure that a connection is maintained in the network. You might fine tune the TCP settings manually. The automatic tunic of TCP settings might not be always ideal.
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