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Solarflare Server Adapter User Guide
Solarflare Adapters on Windows
Issue 20 © Solarflare Communications 2017 228
4.28 Performance Tuning on Windows
• Introduction on page 228
• Tuning Settings on page 229
• Other Considerations on page 236
• Benchmarks on page 241
Introduction
The Solarflare family of network adapters are designed for high ‐ performance
network applications. The adapter driver is pre ‐ configured with default
performance settings that have been designed to give good performance across a
broad class of applications. Occasionally, application performance can be improved
by tuning these settings to best suit the application.
There are three metrics that should be considered when tuning an adapter:
• Throughput
• Latency
• CPU utilization
Different applications may be more or less affected by improvements in these three
metrics. For example, transactional (request ‐ response) network applications can be
very sensitive to latency whereas bulk data transfer applications are likely to be
more dependent on throughput.
The purpose of this section is to highlight adapter driver settings that affect the
performance metrics described. This section covers the tuning of all Solarflare
adapters.
Latency will be affected by the type of physical medium used: 10GBase ‐ T, twinaxial
(direct ‐ attach), fiber or KX4. This is because the physical media interface chip (PHY)
used on the adapter can introduce additional latency. Likewise, latency can also be
affected by the type of SFP/SFP+/QSFP module fitted.
This section is designed for performance tuning Solarflare adapters on Microsoft
Windows. This should be read in conjunction with the reference design board errata
documents and the following Microsoft performance tuning guides:
• Performance Tuning Guidelines for the current version of Windows Server:
http://msdn.microsoft.com/en ‐ us/library/windows/hardware/dn529133
• Performance Tuning Guidelines for previous versions of Windows Server:
http://msdn.microsoft.com/en ‐ us/library/windows/hardware/dn529134.
In addition, you may need to consider other issues influencing performance, such as
application settings, server motherboard chipset, CPU speed, cache size, RAM size,
additional software installed on the system, such as a firewall, and the specification
and configuration of the LAN. Consideration of such issues is not within the scope of
this guide.