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[Bug libc/16029] New: Benchtests are inconsistent.


https://sourceware.org/bugzilla/show_bug.cgi?id=16029

            Bug ID: 16029
           Summary: Benchtests are inconsistent.
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: neleai at seznam dot cz
                CC: drepper.fsp at gmail dot com

When running make bench on ivy bridge processor a you have output for
tail benchtests/bench-strcat.out 
Length  256/  10, alignment  5/ 5:    1282.44    151.531
Length  256/  10, alignment  5/ 5:    1279.66    148.875
Length  512/   1, alignment  6/ 4:    2327.94    192.969
Length  512/   1, alignment  4/ 6:    2993.31    214.375
Length  512/  10, alignment  6/ 6:    2370.69    217.156
Length  512/  10, alignment  6/ 6:    2369.78    215.938
Length 1024/   1, alignment  7/ 6:    4498.62    257.25
Length 1024/   1, alignment  6/ 7:    5808.56    319.281
Length 1024/  10, alignment  7/ 7:    4543.91    317.406
Length 1024/  10, alignment  7/ 7:    4544.72    315.156

and for benchtests/bench-strcat-ifunc.out
Length  256/  10, alignment  5/ 5:    494.703    90.7031    61.6719    151.875
Length  256/  10, alignment  5/ 5:    493.953    93.0781    60.8125    146.906
Length  512/   1, alignment  6/ 4:    924.938    106.062    79.0469    165.844
Length  512/   1, alignment  4/ 6:    1221.88    108.281    88.7812    226.109
Length  512/  10, alignment  6/ 6:    939.766    116.312    89.3906    263.453
Length  512/  10, alignment  6/ 6:    940.234    802.625    122.078    258.594
Length 1024/   1, alignment  7/ 6:    1818.06    113.047    105.156    310.109
Length 1024/   1, alignment  6/ 7:    2399.88    154.656    130.984    452.344
Length 1024/  10, alignment  7/ 7:    1833.78    166.172    130.234    486.016
Length 1024/  10, alignment  7/ 7:    1833.5    163.812    130.344    481.156

Which is quite different performance.

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