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memtest86 怎么查看正反面坏位 memtest86是什么( 二 )


Test 5 [Block move, 64 moves]
This test stresses memory by using block move (movsl) instructions and is based on Robert Redelmeier's burnBX test. Memory is initialized with shifting patterns that are inverted every 8 bytes. Then 4mb blocks of memory are moved around using the movsl instruction. After the moves are completed the data patterns are checked. Because the data is checked only after the memory moves are completed it is not possible to know where the error occurred. The addresses reported are only for where the bad pattern was found. Since the moves are constrained to a 8mb segment of memory the failing address will always be less than 8mb away from the reported address. Errors from this test are not used to calculate BadRAM patterns.
Test 6 [Moving inversions, 32 bit pat]
This is a variation of the moving inversions algorithm that shifts the data pattern left one bit for each successive address. The starting bit position is shifted left for each pass. To use all possible data patterns 32 passes are required. This test is quite effective at detecting data sensitive errors but the execution time is long.
Test 7 [Random number sequence]
This test writes a series of random numbers into memory. By resetting the seed for the random number the same sequence of number can be created for a reference. The initial pattern is checked and then complemented and checked again on the next pass. However, unlike the moving inversions test writing and checking can only be done in the forward direction.
Test 8 [Modulo 20, ones&zeros]
Using the Modulo-X algorithm should uncover errors that are not detected by moving inversions due to cache and buffering interference with the the algorithm. As with test one only ones and zeros are used for data patterns.
Test 9 [Bit fade test, 90 min, 2 patterns]
The bit fade test initializes all of memory with a pattern and then sleeps for 90 minutes. Then memory is examined to see if any memory bits have changed. All ones and all zero patterns are used. This test takes 3 hours to complete. The Bit Fade test is not included in the normal test sequence and must be run manually via the runtime configuration menu.
Error Display
Memtest has two options for reporting errors. The default is to report individual errors. Memtest is also able to create patterns used by the Linux BadRAM feature. This slick feature allows Linux to avoid bad memory pages. Details about the BadRAM feature can be found at:http://home.zonnet.nl/vanrein/badram
For individual errors the following information is displayed when a memory error is detected. An error message is only displayed for errors with a different address or failing bit pattern. All displayed values are in hexadecimal.
Tst: Test Number
Failing Address: Failing memory address
Good: Expected data pattern
Bad: Failing data pattern
Err-Bits: Exclusive or of good and bad data (this shows the position of the failing bit(s))
Count: Number of consecutive errors with the same address and failing bits Error Display
Troubleshooting Memory Errors
Please be aware that not all errors reported by Memtest86 are due to bad memory.
The test implicitly tests the **CPU, L1 and L2 caches as well as the motherboard. **
It is impossible for the test to determine what causes the failure to occur. However, most failures will be due to a problem with memory. When it is not, the only option is to replace parts until the failure is corrected.
出问题时按下面步骤来定温问题：
【memtest86 怎么查看正反面坏位 memtest86是什么】there are steps that may be taken to determine the failing module. Here are four techniques that you may wish to use:
兼容问题导致异常 。
Memtest86 can not diagnose many types of PC failures. For example a faulty CPU that causes Windows to crash will most likely just cause Memtest86 to crash in the same way.
The time required for a complete pass of Memtest86 will vary greatly depending on CPU speed, memory speed and memory size. Here are the execution times from a Pentium-II-366 with64mbof RAM:
Test 0 0:05
Test 1 0:18
Test 2 1:02
Test 3 1:38
Test 4 8:05
Test 5 1:40
Test 6 4:24
Test 7 6:04
Total (default tests) 23:16
Test 8 12:30
Test 9 49:30
Test 10 30:34
Test 11 3:29:40
Total (all tests) 5:25:30
Memtest86 continues executes indefinitely. The pass counter increments each time that all of the selected tests have been run. Generally a single pass is sufficient to catch all but the most obscure errors. However, for complete confidence when intermittent errors are suspected testing for a longer period is advised.
Memory Testing Philosophy
There are many good approaches for testing memory. However, many tests simply throw some patterns at memory without much thought or knowledge of the memory architecture or how errors can best be detected. This works fine for hard memory failures but does little to find intermittent errors.


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