Messages in this thread | | | Date | Fri, 28 Nov 1997 18:16:37 +0200 | Subject | Re: Possible Pentium MMX CPU bug? | From | Yuri Kuzmenko <> |
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In article <19971128153752.49422@thelonious.new.ox.ac.uk> you wrote: AS> Ingo Molnar (mingo@pc7537.hil.siemens.at) wrote: >> I think i have found the reason why certain applications (Quake, GCC) >> crash on certain Pentium MMX processors. I suspect it is a CPU bug. I have >> a testprogram that detects this bug/condition, and have made a Linux >> kernel patch that is a first attempt to work the bug around.
yuri@cs:~$ ./a.out testing bug ... possible Pentium MMX 'missed write' CPU bug detected!
yuri@cs:~$ cat /proc/cpuinfo processor : 0 cpu : 586 model : 4 vendor_id : GenuineIntel stepping : 3 fdiv_bug : no hlt_bug : no f00f_bug : yes fpu : yes fpu_exception : yes cpuid : yes wp : yes flags : fpu vme de pse tsc msr mce cx8 mmx bogomips : 522.65
It's Pentium 166 MMX (overclocked to 266 mhz).
quake2test make core dump now. In next hour I try to run quake2test with pathced kernel.
AS> miles:adam~$ ./mwbug AS> testing bug ... no Pentium MMX 'missed write' bug in this CPU. AS> miles:adam~$ cat /proc/cpuinfo AS> processor : 0 AS> cpu : 586 AS> model : Pentium MMX AS> vendor_id : GenuineIntel AS> stepping : 3 AS> fdiv_bug : no AS> hlt_bug : no AS> sep_bug : no AS> f00f_bug : yes AS> fpu : yes AS> fpu_exception : yes AS> cpuid : yes AS> wp : yes AS> flags : fpu vme de pse tsc msr mce cx8 mmx AS> bogomips : 400.59
AS> It's a 200MHz CPU.
AS> Let me know if I can be of further assistance.
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