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Optimal Network Adaptor Settings for VMXNET3 and Windows 2. R2. Posted by newlife.

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Feb 2. 8, 2. 01. 3 in Virtualization . In this post. I will attempt to point out some of the options and recommended settings for the VMXNET3 adaptor. Global Settings. Receive Side Scaling (RSS)Receive- Side Scaling (RSS) resolves the single- processor bottleneck by allowing the receive side network load from a network adapter to be shared across multiple processors. RSS enables packet receive- processing to scale with the number of available processors. This allows the Windows Networking subsystem to take advantage of multi- core and many core processor architectures. By default RSS is set to enabled.

To disable RSS you must open a command prompt and type: netsh int tcp set global rss=disabled. There is also a second RSS settings that is in the VMXNET3 adaptor properties under the Advanced tab, which is disabled by default. Enable it by selecting from the dropdown. This is a beneficial setting if you have multiple v. CPU’s on the server. If this is a single v. CPU then you will receive no benefit.

If you have multiple v. CPU’s it is recommended to have RSS enabled. Referenceshttp: //technet. TCP Chimney Offload. TCP Chimney Offload is a networking technology that helps transfer the workload from the CPU to a network adapter during network data transfer.

In Windows Server 2. TCP Chimney Offload enables the Windows networking subsystem to offload the processing of a TCP/IP connection to a network adapter that includes special support for TCP/IP offload processing. For VMXNET3 on ESXi 4. TCP Chimney Offload is not supported; turning this off or on has no affect. This is discussed in several places. Referenceshttp: //www- 0.

T1. 01. 26. 48http: //support. The Microsoft KB9. TCP Chimney interacts with programs and services and gives insight to where you can gain the most from this feature. By default this setting is enabled. As for the use of TCP Chimney Offload is to disable as it is not recognized by VMXNET3. To disable do the following. Open a command prompt with administrative credentials.

At the command prompt, type the following command, and then press ENTER: netsh int tcp set global chimney=disabled. To validate or view TCP Chimneynetsh int tcp show global. Recommended setting: disabled Net. DMA State. Net. DMA provides operating system support for direct memory access (DMA) offload. TCP/IP uses Net. DMA to relieve the CPU from copying received data into application buffers, reducing CPU load. Requirements for Net. DMANet. DMA must be enabled in BIOSCPU must support Intel I/O Acceleration Technology (I/OAT)You cannot use TCP Chimney Offload and Net.

DMA together. Recommended setting: disabled. TCP Receive Windows Auto- Tuning Level. Fl Studio Producer Edition 11 0 0 Final Final Soft St.

This feature determines the optimal receive window size by measuring the BDP and the application retrieve rate and adapting the window size for ongoing transmission path and application conditions. Receive Window Auto- Tuning enables TCP window scaling by default, allowing up to a 1. MB maximum receive window size. As the data flows over the connection, it monitors the connection, measures its current BDP and application retrieve rate, and adjusts the receive window size to optimize throughput.

This replaces the TCPWindow. Size registry value. Receive Window Auto- Tuning has a number of benefits. It automatically determines the optimal receive window size on a per- connection basis. In Windows XP, the TCPWindow. Size registry value applies to all connections.

Applications no longer need to specify TCP window sizes through Windows Sockets options. And IT administrators no longer need to manually configure a TCP receive window size for specific computers. By default this setting is enabled, to disable it open a command prompt with administrative permission and type: netsh int tcp set global autotuninglevel=disabled. Recommended setting: disabled. Referenceshttp: //technet.

Add- On Congestion Control Provider. The traditional slow- start and congestion avoidance algorithms in TCP help avoid network congestion by gradually increasing the TCP window at the beginning of transfers until the TCP Receive Window boundary is reached, or packet loss occurs. For broadband internet connections that combine high TCP Window with higher latency (high BDP), these algorithms do not increase the TCP windows fast enough to fully utilize the bandwidth of the connection.

Compound TCP, CTCP increases the TCP send window more aggressively for broadband connections (with large RWIN and BDP). CTCP attempts to maximize throughput by monitoring delay variations and packet loss. It also ensures that its behavior does not impact other TCP connections negatively.

By default, it is on by default under Server 2. Turning this option on can significantly increase throughput and packet loss recovery. To enable CTCP, in elevated command prompt type: netsh int tcp set global congestionprovider=ctcp. To disable CTCP: netsh int tcp set global congestionprovider=none.

Possible options are:  ctcp, none, default (restores the system default value). Recommended setting: ctcp. ECN Capability. ECN (Explicit Congestion Notification) is a mechanism that provides routers with an alternate method of communicating network congestion. It is aimed to decrease retransmissions. In essence, ECN assumes that the cause of any packet loss is router congestion. It allows routers experiencing congestion to mark packets and allow clients to automatically lower their transfer rate to prevent further packet loss. Airport Check For Pirated Software Download there. Traditionally, TCP/IP networks signal congestion by dropping packets.

When ECN is successfully negotiated, an ECN- aware router may set a bit in the IP header (in the Diff. Serv field) instead of dropping a packet in order to signal congestion. The receiver echoes the congestion indication to the sender, which must react as though a packet drop were detected. ECN is disabled by default, as it is possible that it may cause problems with some outdated routers that drop packets with the ECN bit set, rather than ignoring the bit.

To change ECN, in elevated command prompt type: netsh int tcp set global ecncapability=default. Possible settings are: enabled, disabled, default (restores the state to the system default). The default state is: disabled.

ECN is only effective in combination with AQM (Active Queue Management) router policy. It has more noticeable effect on performance with interactive connections and HTTP requests, in the presence of router congestion/packet loss. Its effect on bulk throughput with large TCP Window is less clear. Currently, it is not recommended enabling this setting, as it has negative impact on throughput. Recommended setting is disablednetsh int tcp set global ecncapability=disabled.

Direct Cache Access (DCA)Direct Cache Access (DCA) allows a capable I/O device, such as a network controller, to deliver data directly into a CPU cache. The objective of DCA is to reduce memory latency and the memory bandwidth requirement in high bandwidth (Gigabit) environments. DCA requires support from the I/O device, system chipset, and CPUs. To enable DCA: netsh int tcp set global dca=enabled. Available states are: enabled, disabled.

Default state: disabled. Recommended setting is disabled. To disable DCA: netsh int tcp set global dca=disable. These are just settings that I have used successfully in the VMware environment and work well. You can pick and choose the settings that work best for your environment.