VMware GSX 3 User Manual

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C H A P T E R   6  Performance Tuning and the VMware GSX Server Host
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Configuring GSX Server
The following sections offer advice and information about factors that can affect the 
performance of GSX Server itself. The sections do not address performance of the 
guest operating system or the host operating system. 
Note:  In addition to the GSX Server configuration options discussed below, you 
should always install VMware Tools in any guest operating system for which a VMware 
Tools package exists. Installing VMware Tools provides better video and mouse 
performance and also greatly improves the usability of the virtual machine. For details, 
see 
 in the VMware GSX Server Virtual Machine Guide.
General GSX Server Options
The following sections describe ways you can improve the performance of GSX Server 
on both Windows and Linux hosts.
Guest Operating System Selection
Make certain you select the correct guest operating system for each of your virtual 
machines. To check the guest operating system setting, choose VM > Settings > 
Options > General.
GSX Server optimizes certain internal configurations on the basis of this selection. For 
this reason, it is important to set the guest operating system correctly. The 
optimizations can greatly aid the operating system they target, but they may cause 
significant performance degradation if there is a mismatch between the selection and 
the operating system actually running in the virtual machine. (Selecting the wrong 
guest operating system should not cause a virtual machine to run incorrectly, but it 
may degrade the virtual machine’s performance.) 
Memory Settings
Make sure to choose a reasonable amount of memory for your virtual machine. Many 
modern operating systems have a growing need for memory, so assigning a generous 
amount is beneficial for the best virtual machine performance.
The same holds true for the host operating system, especially a Windows host. 
The New Virtual Machine Wizard automatically selects a reasonable starting point for 
the virtual machine’s memory, but you may be able to improve performance by