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    SubjectRe: x86, ARM, PARISC, PPC, MIPS and Sparc folks please run this
    Quoth Jamie Lokier:
    > Dear All,
    >
    > I'd appreciate if folks would run the program below on various
    > machines, especially those whose caches aren't automatically coherent
    > at the hardware level.

    [snip]

    ----- system one ---
    $ time ./mmap
    Test separation: 4096 bytes: pass
    Test separation: 8192 bytes: pass
    Test separation: 16384 bytes: pass
    Test separation: 32768 bytes: pass
    Test separation: 65536 bytes: pass
    Test separation: 131072 bytes: pass
    Test separation: 262144 bytes: pass
    Test separation: 524288 bytes: pass
    Test separation: 1048576 bytes: pass
    Test separation: 2097152 bytes: pass
    Test separation: 4194304 bytes: pass
    Test separation: 8388608 bytes: pass
    Test separation: 16777216 bytes: pass
    VM page alias coherency test: all sizes passed

    real 0m0.475s
    user 0m0.250s
    sys 0m0.020s
    $ cat /proc/cpuinfo
    processor : 0
    vendor_id : GenuineIntel
    cpu family : 6
    model : 5
    model name : Pentium II (Deschutes)
    stepping : 2
    cpu MHz : 349.200
    cache size : 512 KB
    fdiv_bug : no
    hlt_bug : no
    f00f_bug : no
    coma_bug : no
    fpu : yes
    fpu_exception : yes
    cpuid level : 2
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr
    bogomips : 696.32
    -----

    ----- system two ---
    [kwall]$ time ./mmap
    Test separation: 4096 bytes: pass
    Test separation: 8192 bytes: pass
    Test separation: 16384 bytes: pass
    Test separation: 32768 bytes: pass
    Test separation: 65536 bytes: pass
    Test separation: 131072 bytes: pass
    Test separation: 262144 bytes: pass
    Test separation: 524288 bytes: pass
    Test separation: 1048576 bytes: pass
    Test separation: 2097152 bytes: pass
    Test separation: 4194304 bytes: pass
    Test separation: 8388608 bytes: pass
    Test separation: 16777216 bytes: pass
    VM page alias coherency test: all sizes passed

    real 0m0.134s
    user 0m0.120s
    sys 0m0.010s
    ]$ cat /proc/cpuinfo
    processor : 0
    vendor_id : GenuineIntel
    cpu family : 6
    model : 8
    model name : Pentium III (Coppermine)
    stepping : 3
    cpu MHz : 801.830
    cache size : 256 KB
    fdiv_bug : no
    hlt_bug : no
    f00f_bug : no
    coma_bug : no
    fpu : yes
    fpu_exception : yes
    cpuid level : 2
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
    bogomips : 1599.07
    -----

    ---- system three -----
    $ time ./mmap
    Test separation: 4096 bytes: FAIL - too slow
    Test separation: 8192 bytes: FAIL - too slow
    Test separation: 16384 bytes: FAIL - too slow
    Test separation: 32768 bytes: pass
    Test separation: 65536 bytes: pass
    Test separation: 131072 bytes: pass
    Test separation: 262144 bytes: pass
    Test separation: 524288 bytes: pass
    Test separation: 1048576 bytes: pass
    Test separation: 2097152 bytes: pass
    Test separation: 4194304 bytes: pass
    Test separation: 8388608 bytes: pass
    Test separation: 16777216 bytes: pass
    VM page alias coherency test: minimum fast spacing: 32768 (8 pages)

    real 0m0.101s
    user 0m0.090s
    sys 0m0.010s
    root@advent:~# cat /proc/cpuinfo
    processor : 0
    vendor_id : AuthenticAMD
    cpu family : 6
    model : 4
    model name : AMD Athlon(tm) Processor
    stepping : 2
    cpu MHz : 1210.825
    cache size : 256 KB
    fdiv_bug : no
    hlt_bug : no
    f00f_bug : no
    coma_bug : no
    fpu : yes
    fpu_exception : yes
    cpuid level : 1
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr syscall mmxext 3dnowext 3dnow
    bogomips : 2418.27
    -----

    Now, that was interesting. The AMD is my fastest machine...

    Kurt
    --
    "I have the world's largest collection of seashells. I keep it
    scattered around the beaches of the world ... Perhaps you've seen it.
    -- Steven Wright
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