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    SubjectRe: AMD64 Machine hardlocks when using memset
    On Thu, Mar 31, 2005 at 12:04:59AM +0200, Philip Lawatsch wrote:

    > I do have a very strange problem:
    >
    > If I memset a ~1meg buffer some thousand times (in the userspace) it
    > will hardlock my machine.
    >
    > I've been using 2.6.12-rc1 and also a lot of other kernels (2.6.9,
    > 2.6.11). I've tried it both using a 32 bit kernel and a 64 bit kernel.
    > When running on the 32 bit kernel the machine hardlocks after about
    > 15000 iterations, on a 64 bit kernel the machine hardlocks after about
    > 5000 (the 64 bit system has nearly no background jobs running).
    >
    > I've been running memcheck for several hours now but nothing did show up.
    >
    >
    > I've got an Asus A8N-SLI board with 2 gigs of memory and an AMD 3500+ CPU.
    >
    > The 64 bit kernel was compiled using gcc 3.4.3 and the 32 bit kernel
    > using 3.3.5.
    [...]

    > powernow-k8: Found 1 AMD Athlon 64 / Opteron processors (version 1.00.09e)
    > powernow-k8: 0 : fid 0xe (2200 MHz), vid 0x6 (1400 mV)
    > powernow-k8: 1 : fid 0xc (2000 MHz), vid 0x8 (1350 mV)
    > powernow-k8: 2 : fid 0xa (1800 MHz), vid 0xa (1300 mV)
    > powernow-k8: 3 : fid 0x2 (1000 MHz), vid 0x12 (1100 mV)
    > cpu_init done, current fid 0xe, vid 0x6

    Just a thought: does deactivating cpufreq change anything ?

    I haven't tested yet your program, but on my Asus K8NE-Deluxe very
    strange things happen if cpufreq/powernow is activated *and*
    the cpu frequency is changed...

    Stelian.
    --
    Stelian Pop <stelian@popies.net>
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