62 lines
2.1 KiB
Plaintext
62 lines
2.1 KiB
Plaintext
summary: Test for bz692177 (sysconf(_SC_*CACHE) returns 0 for all caches on)
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description: |
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Bug summary: sysconf(_SC_*CACHE) returns 0 for all caches on some CPUs.
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Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=692177
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Description:
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Description of problem:
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The mechanism that sysconf(3) uses to get the various CACHE parameters
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fails on the Xen 5670
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Version-Release number of selected component (if applicable): 2.12-1.7.el6_0.4
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How reproducible:
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Every time
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Steps to Reproduce:
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1. Find a machine whose /proc/cpuinfo starts something like this:
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vendor_id : GenuineIntel
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cpu family : 6
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model : 44
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model name : Intel(R) Xeon(R) CPU X5670 @ 2.93GHz
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stepping : 2
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2. run "getconf -a | grep CACHE"
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3. Observe values printed
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Actual results:
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All the cache parameter values are zero.
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Expected results:
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Non-zero values for all but the level 4 cache
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Additional info:
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Recent CPUs no longer have useful cpuid leaf 2 cache descriptors. For this
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particular machine, cpuid 2 returns 0x55035a01 0xf0b2ff 0x0 0xca0000 in eax,
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ebx, ecx and edx respectively. The 0xff in the least significant byte of
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ebx indicates that you need to use cpuid leaf 4. Actually, for all but
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somewhat old CPUs you're better off using cpuid leaf 4 anyway (the only
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machines I have access to that have a cpuid level less than four are a
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"Intel(R) Pentium(R) 4 CPU 1.70GHz" and "Intel(R) Pentium(R) 4 CPU 2.40GHz"
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both of which are long past their use-by date).
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contact: Miroslav Franc <mfranc@redhat.com>
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component:
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- glibc
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test: ./runtest.sh
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framework: beakerlib
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recommend:
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- glibc
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tag:
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- simple
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- noEWA
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- Tier1
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- not-er15271
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- glibc-buildroot-ready
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duration: 15m
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link:
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- relates: https://bugzilla.redhat.com/show_bug.cgi?id=692177
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extra-summary: /tools/glibc/Regression/bz692177-sysconf-SC-CACHE-returns-0-for-all-caches-on
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extra-task: /tools/glibc/Regression/bz692177-sysconf-SC-CACHE-returns-0-for-all-caches-on
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