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Knowledge Base

Virtual machine application runs slower than expected in ESXi (1018206)

Last Updated: 2/27/2024Categories: TroubleshootingTotal Views: 308316Language:
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Learn how VMware Skyline Advisor and Skyline Health Diagnostics work together to provide proactive intelligence and self-service log analysis.

Use Skyline Advisor to avoid issues before they occur across VCF, vSphere, vSAN, NSX, vROps & Horizon. Skyline Findings are based on top KBs, VMSAs/CVEs and design best practices.

Use Skyline Health Diagnostics to root cause vSphere & vSAN logs when an issue occurs. Skyline Health Diagnostic Findings are based on top KBs and VMSA/CVEs. You can use the Skyline Health Diagnostics tool in online or offline mode.

If you require additional help from technical support, please use Skyline Advisor to initiate a Log Assist to reduce time to upload logs. TSEs can also initiate logs to reduce effort.

Symptoms

Virtual machine application performance is poor when compared to another host.

Applications run slower than expected. When they are moved to another host, performance improves.

Virtual machines encounter higher than expected CPU %Ready times in ESXTOP.

Processor Power Management (Power Saving, Power Scaling) is impacting application performance on virtual machines.

vDGA/vSGA performance is sluggish on View desktops.

Tera2800 performance is less than expected in a View PCoIP session.

Purpose

To increase the virtual machine application performance, disable the power management.

Resolution

Poor performance may be related to processor power management implemented either by ESXi/ESX or by the server hardware. Certain applications that are very sensitive to processing speed latencies may show less than expected performance when processor power management features are enabled. It may be necessary to turn off ESXi/ESX and server hardware power management features to achieve the best performance for such applications.

Disabling power management usually results in more power being consumed by the system, especially when it is lightly loaded. The majority of applications benefit from the power savings offered by power management, with little or no performance impact. Therefore, if disabling power management does not realize any increased performance, VMware recommends that power management be re-enabled to reduce power consumption.

Disabling ESXi/ESX Power Management

The ESXi/ESX kernel can manage processor power usage on supported hardware whose BIOS settings are configured to allow OS-controlled power management. In this case, you can select from various ESXi/ESX power management policies using the vSphere Client Host Configuration panel.

ESXi 6.5, 6.0, 5.5, 5.1, 5.0 and ESXi/ESX 4.1

There are four Power Management policies available in ESXi 5.0, 5.1, 5.5, 6.0, 6.5 and ESXi/ESX 4.1:

High Performance

Balanced (Default)

Low Power

Custom

Choose High Performance to disable power management.

If you see only one policy (not supported), then the hardware either does not support power management, or its BIOS settings are configured to disallow OS-controlled power management.

Note: When using vSphere 5.x Host Profiles with ESXi 5.x hosts that support power management, the CPU power system policy is retained within the host configuration policy and can be applied to other hosts within the environment. For more information, see vSphere Host Profiles Guide.

Disabling Hardware Power Management

Disabling processor power management in the server hardware is vendor specific. Here are some common server platforms:

HP ProLiant servers with the HP Power Profile option (ProLiant G6 or greater)

Review both the HP Power Profile and HP Power Regulator Mode in the BIOS settings. For HP Power Profile, you see these options:

Balanced Power and Performance

Minimum Power Usage

Maximum Performance

Custom

Choose Maximum Performance to disable power management. If Custom is already selected, refer to the Power Regulator Mode options below. If you choose Custom, set the HP Power Regulator Mode to OS Control Mode.

HP ProLiant servers without the HP Power Profile option

Review the Power Regulator Modes in the BIOS settings. You see these options:

HP Static High Performance mode

HP Static Low Power mode

HP Dynamic Power Savings mode

OS Control mode

Ultra Low Power Mode

Choose HP Static High Performance mode to disable power management. If OS Control mode is selected, see the preceding section for disabling power management within the OS.

Note: Some HP BIOS settings may include an option called Ultra Low Power Mode. This only applies in HP Static Low Power Mode or HP Dynamic Power Savings Mode, and allows the CPU to transition to its lowest power state.

Dell PowerEdge 11th Generation servers with BIOS

Review the Power Management in the BIOS settings. You see these options:

OS Control

Active power control

Custom

Maximum Performance

Choose Maximum Performance to disable power management. If Custom is selected, this allows for modification of the CPU Power and Performance, Fan Power and Performance, and Memory Power and Performance Management. If using Custom, set the various subsystems mentioned previously to Maximum Performance. If OS Control mode is selected, set the various subsystems to OS DBPM and see the section above for disabling power management within the OS.

Dell PowerEdge 12th Generation servers with UEFI

Review the System Profile modes in the System Setup > System BIOS settings. You see these options:

Performance Per Watt (DAPC-System)

Performance Per Watt (OS)

Performance

Dense Configuration (DAPC-System)

Custom

Choose Performance to disable power management. If Custom is selected, this allows for modification of the CPU Power Management, Memory Frequency and Turbo Boost (when applicable CPUs are used). If using Custom, set the various subsystems mentioned previously to Maximum Performance. If you choose Performance Per Watt (OS), see the section above for disabling power management within the OS.

Note: Some Dell UEFI settings may include an option called Dense Configuration (DAPC-System). For more information on this setting, see Dell PowerEdge 12th Generation Server System Profiles

Note: If you require further help locating these options in the BIOS, please involve your Hardware vendor.

Note: The preceding link was correct as of April 8, 2015. If you find the link is broken, provide a feedback and a VMware employee will update the link.

Related Information

For more information, see:

HP document –Power Regulator Mode  https://techlibrary.hpe.com/docs/iss/proliant_uefi/UEFI_TM_030617/s_set_hp_power_regulator.html

Dell documentation – PowerEdge 11g BIOS Settings for High Performance Computing

Fujitsu documentation - Fujitsu Primergy Server BIOS Settings for performance

Note: The preceding links were correct as of November 26, 2014. If you find the link is broken, provide feedback and a VMware employee will update the link.

For more information on Performance Best Practices for VMware vSphere, see:

<u>Performance Best Practices for VMware vSphere 5.5</u>

Performance Best Practices for VMware vSphere 5.1

Performance Best Practices for VMware vSphere 5.0

Performance Best Practices for VMware vSphere 4.1

Performance Best Practices for VMware vSphere 4.0

Power Management and Performance in VMware vSphere 5.1 and 5.5

Note: It may be necessary to reboot the host after changing the power management from the vSphere Client.

ESXiでの仮想マシンのアプリケーションが予想よりも遅く実行されます
ESXi 里虚拟机应用程序运行比预期慢

Detectable by VMware SkylineTM

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