Red Hat LINUX VIRTUAL SERVER - FOR ENTERPRISE LINUX 5.2 REV 05-2008 Instrukcja Użytkownika Pobierz pdf (Strona 10)

System z kernel features – z10 support

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CPU node affinity (kernel 2.6.25)

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With this feature the kernel uses CPU topology information as supplied by the

IBM System z10. This information is used by the scheduler to build scheduling

domains and should increase overall performance on SMP machines.

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This support is available only on IBM System z10,

when running Linux on System z in an LPAR.

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Vertical CPU management (kernel 2.6.25)

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With this feature it is possible to switch between horizontal and vertical CPU

polarization via a sysfs attribute.

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If vertical CPU polarization is active then the hypervisor will dispatch certain

CPUs for a longer time than other CPUs for maximum performance.

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There are three different types of vertical CPUs: high, medium and low. "Low"

CPUs get hardly any real CPU time, while "high" CPUs get a full real CPU;

"medium" CPUs get something in between.

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By default the old horizontal CPU polarization is active.

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This support is available only on z10,

running Linux on System z in an LPAR.

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Red Hat LINUX VIRTUAL SERVER - FOR ENTERPRISE LINUX 5.2 REV 05-2008 Instrukcja Użytkownika Strona 10