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40 Appendix AXD Tools Test Reference

Test Estimated completion time Description

Walking Spread Bit 32 5 minutes Walks 0b01 up and then walks

0b10 down memory.

Walking Bit Flip 32 5 minutes Alternates words with walking

1 and walking 0, and then

alternates with walking 0 and

walking 1.

Multicore Memory Tests

Multicore memory tests test the rst 2.5 GB of memory using all available CPU cores.

In AXD EFI tools, all memory tests (simple, multicore, and extended) are grouped under

Memory tests.

Note: The time required to complete memory tests correlates to the size of memory

being tested. These estimates are based on testing 1 GB of memory.

Test Estimated completion time Description

MP Block Checkerboard 32 5 seconds Alternates 32-bit words with all

1s and all 0s, and then with all

0s and all 1s.

MP Bit Checkerboard 32 5 seconds Alternates bits with all 1s and

all 0s, and then with all 0s and

all 1s.

MP Sequential Byte Block 32 8 minutes Fills all bytes sequentially with

patterns starting at 0x00 and

ending at 0xFF.

MP Walking One 32 2 minutes Walks 1s up and down memory.

MP Walking Zero 32 2 minutes Walks 0s up and down memory.

MP Walking Spread Bit 32 2 minutes Walks 0b01 up and then walks

0b10 down memory.

MP Walking Bit Flip 32 2 minutes Alternates words with walking

1 and walking 0, and then

alternates words with walking 0

and walking 1.

Check Hardware Errors 1 second Tests specic registers for

memory related errors. Running

this test at the end of memory

testing may help catch memory

errors generated during other

memory tests.

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Apple Xserve - Apple Xserve Manual do Utilizador Página 40