6.0.1

Table 1‑75. Networking Performance Enhancement Advice (Continued)
# Resolution
9 Verify that all NICs are running in full duplex mode. Hardware connectivity problems might result in a NIC
resetting itself to a lower speed or half duplex mode.
10 Use vNICs that are TCP Segmentation Offload (TSO)-capable, and verify that TSO-Jumbo Frames are enabled
where possible.
Resource Pools
The resource pool charts contain information about CPU and memory usage for resource pools. The help
topic for each chart contains information about the data counters displayed in that chart. The counters
available are determined by the collection level set for vCenter Server.
CPU (MHz)
The CPU (MHz) chart displays CPU usage in the resource pool or vApp.
This chart is located in the Home view of the Resource Pool or vApp Performance tab.
Counters
Table 1‑76. Data Counters
Chart Label Description
Usage CPU usage is the sum of the average CPU usage values of the virtual machines in the resource
pool or vApp.
CPU usage = number of cores * CPU frequency
n
Counter: usagemhz
n
Stats Type: Rate
n
Unit: Megahertz (MHz)
n
Rollup Type: Average (Minimum/Maximum)
n
Collection Level: 1 (4)
Chart Analysis
A short spike in CPU usage indicates that you are making the best use of the resources available. However,
if the value is constantly high, the CPU demanded is likely greater than the CPU capacity available. A high
CPU usage value can lead to increased ready time and processor queuing of the virtual machines in the
resource pool. Generally, if the CPU usage value for a virtual machine is above 90% and the CPU ready
value for a virtual machine is above 20%, performance is impacted.
If performance is impacted, consider taking the following actions.
Table 1‑77. CPU Performance Enhancement Advice
# Resolution
1 Verify that VMware Tools is installed on each virtual machine.
2 Deploy single-threaded applications on uniprocessor virtual machines instead of SMP virtual machines.
3 Migrate one or more virtual machines to a new host.
4 Upgrade the physical CPUs or cores on each host if necessary.
5 Enable CPU-saving features, such as TCP Segmentation Offload.
6 Replace software I/O with dedicated hardware, such as iSCSI HBAs or TCP Segmentation Offload NICs.
vSphere Monitoring and Performance
58 VMware, Inc.