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1. #High volume packet sender manual#
2. #High volume packet sender software#
3. #High volume packet sender windows#

Performance Tuning for Low Latency Packet Processing If the network adapter does not perform interrupt moderation, but it does expose buffer coalescing, increasing the number of coalesced buffers allows more buffers per send or receive, which improves performance. You should consider interrupt moderation for CPU-bound workloads, and consider the trade-off between the host CPU savings and latency versus the increased host CPU savings because of more interrupts and less latency. To control interrupt moderation, some network adapters expose different interrupt moderation levels, buffer coalescing parameters (sometimes separately for send and receive buffers), or both.

#High volume packet sender manual#

If a network adapter does not expose manual resource configuration, it either dynamically configures the resources, or the resources are set to a fixed value that cannot be changed. Therefore, for receive-intensive scenarios, we recommend that you increase the receive buffer value to the maximum. The low value results in dropped packets and decreased performance.

Some network adapters set their receive buffers low to conserve allocated memory from the host. Increasing Network Adapter Resourcesįor network adapters that allow manual configuration of resources, such as receive and send buffers, you should increase the allocated resources. Your network adapter might have options to change the number of RSS queues as part of the driver. To get started with RSS Profiles, you can review the available profiles to understand when they are beneficial and how they apply to your network environment and hardware.įor example, if you open Task Manager and review the logical processors on your server, and they seem to be underutilized for receive traffic, you can try increasing the number of RSS queues from the default of 2 to the maximum that is supported by your network adapter. The default profile is NUMA Static, which changes the default behavior from previous versions of the operating system.

#High volume packet sender windows#

RSS predefined profiles are new in Windows Server 2012. To determine whether a network adapter is RSS-capable, you can view the RSS information on the network adapter properties Advanced Properties tab. In this circumstance, you should use RSS-capable network adapters or disable RSS on the network adapter properties Advanced Properties tab. It is important to note that due to the logic in RSS and Hypertext Transfer Protocol (HTTP) for load distribution, performance might be severely degraded if a non-RSS-capable network adapter accepts web traffic on a server that has one or more RSS-capable network adapters. When all the web traffic is going through the RSS-capable network adapters, incoming web requests from different connections can be simultaneously processed across different CPUs.

RSS can improve web scalability and performance when there are fewer network adapters than logical processors on the server. Enabling Receive Side Scaling (RSS) for Web Servers

Some network adapters require offload features to be independently enabled for send and receive paths. However, if the reduced throughput is not expected to be a limitation, you should enable offload capabilities, even for this type of network adapter. For example, enabling segmentation offload can reduce the maximum sustainable throughput on some network adapters because of limited hardware resources. Sometimes, however, the network adapter is not powerful enough to handle the offload capabilities with high throughput. Turning on network adapter offload features is usually beneficial. The following sections describe some of your performance tuning options. If your network adapter provides tuning options, you can optimize network throughput and resource usage to achieve optimum throughput based on the parameters described above.

#High volume packet sender software#

The server hardware and software resources The type of workload performed by the server Performance Tuning for Low Latency Packet Processingĭetermining the correct tuning settings for your network adapter depend on the following variables: This topic contains the following sections.Įnabling Receive Side Scaling (RSS) for Web Servers