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Appendix AXD Tools Test Reference 39

Memory Tests

All memory tests are listed under Memory. These tests are described here.

Simple Memory Tests

Simple memory tests test the rst 2.5 GB of memory. To test all memory, run extended

memory tests.

Even though simple memory tests don’t test all memory, run these tests to detect

intermittent memory issues.

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

Address as Data 5 seconds Tests memory using the

memory address as data.

Patterns 25 seconds Tests memory using dierent

data patterns.

Marching Ones and Zeros 15 seconds Tests memory by walking 1s and

0s up and down memory.

Knaizuk Hartmann 10 seconds Tests memory using this

algorithm.

MOD3 30 seconds Tests memory using this

algorithm.

March U 2 minutes Tests memory using this

algorithm.

Random 15 seconds Uses pseudo-random values.

Block Checkerboard 32 10 seconds Alternates 32-bit words with all

1s and all 0s, and then with all

0s and all 1s.

Bit Checkerboard 32 10 seconds Alternates bits with all 1s and

all 0s, and then with all 0s and

all 1s.

Sequential Byte Block 32 14 minutes Fills all bytes sequentially with

patterns starting at 0x00 and

ending at 0xFF.

Walking One 32 5 minutes Walks 1s up and down memory.

Walking Zero 32 5 minutes Walks 0s up and down memory.

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Apple Xserve - Apple Xserve Manual do Utilizador Página 39