Messages in this thread | | | Date | Sat, 3 May 2008 21:54:48 +0200 | From | Ingo Molnar <> | Subject | Re: i387/FPU init issues... |
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* H. Peter Anvin <hpa@zytor.com> wrote:
>> This might also be caused by a calibration error. We've seen enough >> of them already. > > No doubt. However, there is *something* ugly going on.
i think a vital clue can be found in the original report:
| I am able to reproduce the issue consistently on my laptop using qemu | (which helped speed debugging a bit). I have also narrowed it down to | include/asm-x86/i387.h::__save_init_fpu in (32 bit version) - it dies | somewhere in calling the following line:
so it might just be incorrect Qemu emulation of a PII's NOP instruction?
(which btw. probably proves that Linux is the first OS to make intelligent use of those instructions?)
Ingo
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