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Networking
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Performance Tuning for Heavy
Network Loads
If your virtual machines have heavy network loads composed of many connections,
you may be able to improve performance by using the interrupt clustering feature of
ESX Server.
Interrupt clustering allows ESX Server to consume less CPU time for inbound packets
by handling many of them at once. You will need to experiment with the values for
these parameters to determine the best settings for your configuration.
Enabling Interrupt Clustering
Interrupt clustering is turned off by default. When you enable interrupt clustering, it
takes effect for all virtual machines running on the server.
Use the VMware Management Interface to enable it. Log in to the management
interface as root, click Configure System, then click Network Configuration. On the
Network Configuration page, enable interrupt clustering, then follow the link to the
VMkernel Configuration page, where you can adjust the parameters.
Interrupt Clustering Parameters
NetRXClusterThreshOn
This parameter specifies the interrupt rate at which the VMkernel should switch to
polling mode. Once in polling mode, the network adapter no longer generates
interrupts when packets arrive, and packets are handled at regular intervals specified
by NetRXClusterTMaxFreq.
Lowering the value of this parameter can increase performance at higher traffic rates.
Raising the value of this parameter can increase performance at lower traffic rates.
Recommended range: 2000–20000
NetRXClusterThreshOff
This parameter specifies the interrupt rate at which the VMkernel should switch back
to interrupt mode. In interrupt mode, the network adapter will interrupt the VMkernel
whenever a packet has arrived. The value of this parameter should be lower than
NetRXClusterThreshOn. A value that is half of NetRXClusterThreshOn is a good starting
point.
Lowering the value of this parameter can increase performance at higher traffic rates.
Raising the value of this parameter can increase performance at lower traffic rates.
- VMware ESX Server 1
- VMware, Inc 2
- 3145 Porter Drive 2
- Palo Alto, CA 94304 2
- Table of Contents 3
- Welcome to VMware ESX Server 13
- What’s New in Version 1.5 15
- System Requirements 17
- Legacy Devices 21
- Technical Support Resources 22
- Installing, Configuring and 25
- Upgrading ESX Server 25
- ESX Server 26
- Before You Begin 28
- Installing VMware ESX Server 28
- Your Server 33
- 7. Click Perform Action 54
- GSX Server Virtual Machines 71
- Preparing to Use the Remote 79
- Management Software 79
- Linux – RPM Installer 81
- Linux – Tar Installer 81
- Remote Console on page 114 82
- Workstation 84
- Using the VMware Management 94
- Interface 94
- Management Interface 99
- Running VMware ESX Server 105
- Management Interface window 105
- Using Disk Modes 108
- Monitoring System Status 109
- Using the Remote Console 114
- VMware Tools Settings 117
- Cutting, Copying and Pasting 119
- Using SNMP with ESX Server 125
- Configuring SNMP Security 132
- Name Data type Description 139
- Backing Up Virtual Machines 140
- Operating Systems 144
- Guest Operating System 147
- Guest Operating Systems 149
- To enable expert mode, 154
- To enable expert mode, … 156
- Service 167
- Console Operating System and 169
- VMkernel 169
- Operating System 171
- The VMkernel Loader 173
- VMkernel Device Modules 174
- Machines 179
- Configuring Virtual Machines 181
- Using VMkernel Devices 182
- Modifying the SMBIOS UUID 187
- Enabling Repeatable Resumes 191
- Authenticating Users 193
- Default Permissions 194
- Using vmkfstools 199
- Naming VMFS File Systems 205
- Determining SCSI Target IDs 208
- Sharing the SCSI Bus 210
- Using Storage Area Networks 212
- Networking 215
- Promiscuous Mode 222
- Sharing Network Adapters and 224
- Virtual Networks 224
- Performance Tuning for Heavy 228
- Network Loads 228
- Resource Management 231
- CPU Resource Management 234
- Multiprocessor Systems 235
- Memory Resource Management 239
- Admission Control 240
- Dynamic Allocation 240
- Memory Reclamation 241
- Memory Sharing 242
- Sizing Memory on the Server 249
- Virtual Machine Memory 250
- Memory Overcommitment 251
- More Information 252
- Network Bandwidth Management 253
- Disk Bandwidth Management 257
- Configuration File Options 258
- Glossary 261
- Appendix A: I/O Adapter 265
- Compatibility Guide 265
- Linux Driver Compatibility 267
- VMware Certification 267
- Adaptec SCSI Adapters 268
- Emulex Fibre Channel Adapters 272
- QLogic Fibre Channel Adapters 272
- Compaq RAID Controllers 272
- Mylex DAC960 RAID Controllers 273
- Intel Gigabit Ethernet NICs 277
- The OpenSSL Toolkit License 280
- License Issues 280
- Original SSLeay License 281
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