| SunVTS 6.2 Test Reference Manual for x86 Platforms
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Data Translation Look-Aside Buffer (dtlbtest)
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dtlbtest Description
The dtlbtest verifies the proper functioning of DTLBs, but it does not measure performance of DTLBs.
This test verifies the following function of DTLBs:
- Hit/miss tests - Stress DTLBs by generating large numbers of TLB hits and misses.
- Address Pattern tests - Verify that DTLBs correctly translate virtual addresses to physical addresses with stressful address patterns.
dtlbtest detects the installed CPU type and iterprets the CPU architecture.
dtlbtest is classified as an exclusive SunVTS test because its accuracy and coverage depend significantly on the system's background quietness. For the best result, avoid performing any other SunVTS tests in the background, and also disable all user processes and nonessential daemons.
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Caution - This is an exclusive mode test. This test can not be run in parallel with any other tests or applications.
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Note - To test 4 MByte pages, Intimate Shared Memory (ISM) must be enabled. If not already present, append the following to /etc/system and reboot:
set shmsys:shminfo_shmmax=0xFFFFFFFFFFFFFFFF
set shmsys:shminfo_shmmin=1
set shmsys:shminfo_shmmni=100
set shmsys:shminfo_shmseg=10
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dtlbtest Options
To reach the following dialog box, select the exclusive test mode and right-click on the test name in the System Map and select Test Parameter Options. If you do not see this test in the System Map, you might need to expand the collapsed groups, or your system may not include the device appropriate to this test. Refer to the SunVTS User's Guide for more details.
FIGURE 7-1 dtlbtest Test Parameter Options Dialog Box
TABLE 7-1 dtlbtest Options
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Option
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Description
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Processor ID
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Specifies the CPU ID for testing. The default value is all.
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Test Type
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Specifies the type of test need to be performed, Hit/miss, address pattern, or both. The default value is both.
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Page Size
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Specifies the DTLB page size to test. The default value is all. Possible page size values are 8k, 64k, 512K, and 4M.
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Address Pattern loop count
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Specifies the address pattern loop count. The default value is 1. Loop count value ranges between 1 and 1000.
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Address pattern seed value
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Specifies the address pattern seed value. The default value is 0.
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TABLE 7-2 dtlbtest Supported Test Modes
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Test Mode
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Description
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Exclusive
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Performs only the dtlbtest (full test).
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dtlbtest Command-Line Syntax
/opt/SUNWvts/bin/dtlbtest [-scruvdtlxnf] [-p n] [-i n] [-w n] [-o cpu=N,test=x,psize=x,aloop=n,aseed=n]
TABLE 7-3 dtlbtest Command-Line Syntax
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Argument
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Description
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cpu=cpuid
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Specifies the CPU ID. The default value is all.
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test=testType
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Specifies the type of test h, a, or both. The default value is both.
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psize=pageSize
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Specifies the page size to be tested. The default value is all.
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aloop=loopCount
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Specifies the address pattern loop count. The default value is 1.
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aseed=seedValue
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Specifies the address pattern seed value. The default value is 0.
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| SunVTS 6.2 Test Reference Manual for x86 Platforms
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819-6456-10
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Copyright © 2006, Sun Microsystems, Inc. All Rights Reserved.