Brocade Communications Systems CNA 1010 Troubleshooting Manual page 118

4
Tuning network drivers (CNAs only)
Jumbo packet size
Recommendations to enhance performance
Increase throughput by setting MTU to 9000 bytes.
How to change values
Refer to instructions for Windows "network driver parameters" in Appendix A of the Brocade
Adapters Installation and Reference Manual.
References for more tuning information
Refer to the 10Gbps Networking Performance on ESX 3.5 Update 1 available through
www.vmware.com.
NetQueue
NetQueue improves receive-side networking performance on servers in 10 Gigabit Ethernet
virtualized environments. NetQueue provides multiple receive queues on the CNA, which allows
processing on multiple CPUs to improve network performance.
MSI-X is an eXtended version of Message Signaled Interrupts defined in the PCI 3.0 specification.
All Brocade adapters support MSI-X, which helps improve overall system performance by
contributing to lower interrupt latency and improved host CPU utilization. MSI-X is enabled by
default in VMware ESX Server 3.5, and must remain enabled for NetQueue to function. Please
make sure that bnad_msix=0 is not listed in VMware module parameters because that would
disable NetQueue.
For the Brocade driver, you cannot directly configure the number of NetQueue and filters per
NetQueue. By default, these values are based on the number of receive queue sets used, which is
calculated from the number of CPUs in the system. You can change the number of NetQueues from
the default (number of CPUs) by setting the number of receive queue sets (bnad_rxqsets_used).
Default value: Disable
Possible values: Enable, Disable
Recommendations to enhance performance
Enabling NetQueue utilizes multiple receive queues of the Brocade adapter, which can be handled
by multiple CPUs on the host system, thus improving performance.
How to change values
Refer to instructions for Windows "network driver parameters" in Appendix A of the Brocade
Adapters Installation and Reference Manual.
References for more tuning information
Refer to the 10Gbps Networking Performance on ESX 3.5 Update 1 available through
www.vmware.com.
98 Brocade Adapters Troubleshooting Guide
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