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    SubjectRe: Machines misreporting Bogomips
    Date
    On Fridayen den 1 February 2002 00.21, Matthew Dharm wrote:
    > I don't know if this will help much, but I have seen that type of
    > performance drop on systems when the entire cache is disabled.
    >
    > Matt

    From the report below...
    > > cache size : 0 KB

    /RogerL

    >
    > On Thu, Jan 31, 2002 at 05:55:57PM -0500, Greg Boyce wrote:
    > > kernel folk,
    > >
    > > I've got a strange issue that I've been struggling to find the solution
    > > to for some time now.
    > >
    > > I work in a group that assists in the managing of large numbers of
    > > deployed linux boxes running variants of the 2.2 kernel on them. The
    > > machines themselves are all pretty standard. There are slight variances
    > > on vendors, cpu speeds, etc., but they're all running from the same
    > > motherboards.
    > >
    > > Every once in a while we come across single machines which are running a
    > > lot slower than they should be, and are misreporting their speed in
    > > bogomips under /proc/cpuinfo. Reinstalling the OS and changing versions
    > > of the kernel don't appear to affect the machines themselves at all.
    > >
    > > I was wondering if anyone would be able to provide me with a starting
    > > point to hunt this down. The only solution we had found in the past was
    > > to replace the machines, but some of them are located out of the country
    > > and that would be expensive.
    > >
    > > Here is the output from /proc/cpuinfo for machines. The first machine is
    > > normal, the second is affected by this bug. They're both running the
    > > same hardware, although the first machine's CPU is 650mhz instead of
    > > 500mhz.
    > >
    > > Machine 1:
    > > processor : 0
    > > vendor_id : GenuineIntel
    > > cpu family : 6
    > > model : 8
    > > model name : Pentium III (Coppermine)
    > > stepping : 3
    > > cpu MHz : 645.676332
    > > cache size : 0 KB
    > > fdiv_bug : no
    > > hlt_bug : no
    > > sep_bug : no
    > > f00f_bug : no
    > > coma_bug : no
    > > fpu : yes
    > > fpu_exception : yes
    > > cpuid level : 3
    > > wp : yes
    > > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
    > > cmov pat pse36 psn mmx osfxsr kni
    > > bogomips : 643.89
    > >
    > > Machine 2:
    > > processor : 0
    > > vendor_id : GenuineIntel
    > > cpu family : 6
    > > model : 7
    > > model name : Pentium III (Katmai)
    > > stepping : 3
    > > cpu MHz : 496.677416
    > > cache size : 512 KB
    > > fdiv_bug : no
    > > hlt_bug : no
    > > sep_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 osfxsr kni
    > > bogomips : 4.06
    > >
    > > Let me know if there's anything else I can provide to help with the
    > > diagnosis. The machine itself is an IBM Netfinity 4000R.
    > >
    > > --
    > > Gregory Boyce
    > >
    > >
    > > -
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    > > in the body of a message to majordomo@vger.kernel.org
    > > More majordomo info at http://vger.kernel.org/majordomo-info.html
    > > Please read the FAQ at http://www.tux.org/lkml/

    --
    Roger Larsson
    Skellefteå
    Sweden
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