summary: Test for bz692177 (sysconf(_SC_*CACHE) returns 0 for all caches on)
description: |
    Bug summary: sysconf(_SC_*CACHE) returns 0 for all caches on some CPUs.
    Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=692177

    Description:

    Description of problem:
      The mechanism that sysconf(3) uses to get the various CACHE parameters
      fails on the Xen 5670

    Version-Release number of selected component (if applicable): 2.12-1.7.el6_0.4

    How reproducible:
      Every time

    Steps to Reproduce:
    1.  Find a machine whose /proc/cpuinfo starts something like this:

      vendor_id       : GenuineIntel
      cpu family      : 6
      model           : 44
      model name      : Intel(R) Xeon(R) CPU           X5670  @ 2.93GHz
      stepping        : 2

    2. run "getconf -a | grep CACHE"
    3. Observe values printed
      
    Actual results:
      All the cache parameter values are zero.

    Expected results:
      Non-zero values for all but the level 4 cache

    Additional info:
      Recent CPUs no longer have useful cpuid leaf 2 cache descriptors.  For this
      particular machine, cpuid 2 returns 0x55035a01 0xf0b2ff 0x0 0xca0000 in eax,
      ebx, ecx and edx respectively.  The 0xff in the least significant byte of
      ebx indicates that you need to use cpuid leaf 4.  Actually, for all but
      somewhat old CPUs you're better off using cpuid leaf 4 anyway (the only
      machines I have access to that have a cpuid level less than four are a
      "Intel(R) Pentium(R) 4 CPU 1.70GHz" and "Intel(R) Pentium(R) 4 CPU 2.40GHz"
      both of which are long past their use-by date).
contact: Miroslav Franc <mfranc@redhat.com>
component:
  - glibc
test: ./runtest.sh
framework: beakerlib
recommend:
  - glibc
tag:
  - simple
  - noEWA
  - Tier1
  - not-er15271
  - glibc-buildroot-ready
duration: 15m
link:
  - relates: https://bugzilla.redhat.com/show_bug.cgi?id=692177
extra-summary: /tools/glibc/Regression/bz692177-sysconf-SC-CACHE-returns-0-for-all-caches-on
extra-task: /tools/glibc/Regression/bz692177-sysconf-SC-CACHE-returns-0-for-all-caches-on