Red Hat ENTERPRISE LINUX 5 - VIRTUALIZATION GUIDE Installationsanleitung PDF herunterladen (Seite 128)

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10. ⁠

Memo ry an d C PU allo cat ion

The Memory and CPU Allocation window displays. Choose appropriate values for the

virtualized CPUs and RAM allocation. These values affect the host's and guest's

performance.

Guests require sufficient physical memory (RAM) to run efficiently and effectively. Choose a

memory value which suits your guest operating system and application requirements.

Remember, guests use physical RAM. Running too many guests or leaving insufficient

memory for the host system results in significant usage of virtual memory and swapping.

Virtual memory is significantly slower which causes degraded system performance and

responsiveness. Ensure you allocate sufficient memory for all guests and the host to operate

effectively.

Assign sufficient virtual CPUs for the guest. If the guest runs a multithreaded application,

assign the number of virtualized CPUs the guest will require to run efficiently. Do not assign

more virtual CPUs than there are physical processors (or hyper-threads) available on the

host system. It is possible to over allocate virtual processors, however, over allocating has a

significant, negative effect on guest and host performance due to processor context switching

overheads.

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Red Hat ENTERPRISE LINUX 5 - VIRTUALIZATION GUIDE Installationsanleitung Seite 128