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Re: i387/FPU init issues...
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From: H. Peter Anvin
Subject:
Re: i387/FPU init issues...
Date: Saturday, May 3, 2008 - 12:56 pm
Ingo Molnar wrote:
quoted text
> * 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?) >
Ah, yes, this is a Qemu bug, then. And yes, it probably does mean exactly that :) -hpa --
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Messages in current thread:
i387/FPU init issues...
, jamal
, (Sat May 3, 3:32 am)
Re: i387/FPU init issues...
, James Courtier-Dutton
, (Sat May 3, 3:57 am)
Re: i387/FPU init issues...
, jamal
, (Sat May 3, 6:53 am)
Re: i387/FPU init issues...
, Thomas Gleixner
, (Sat May 3, 8:31 am)
Re: i387/FPU init issues...
, jamal
, (Sat May 3, 10:02 am)
Re: i387/FPU init issues...
, Ingo Molnar
, (Sat May 3, 10:34 am)
Re: i387/FPU init issues...
, Thomas Gleixner
, (Sat May 3, 10:39 am)
Re: i387/FPU init issues...
, H. Peter Anvin
, (Sat May 3, 10:42 am)
Re: i387/FPU init issues...
, James Courtier-Dutton
, (Sat May 3, 10:50 am)
Re: i387/FPU init issues...
, H. Peter Anvin
, (Sat May 3, 10:51 am)
Re: i387/FPU init issues...
, Thomas Gleixner
, (Sat May 3, 11:18 am)
Re: i387/FPU init issues...
, H. Peter Anvin
, (Sat May 3, 11:48 am)
Re: i387/FPU init issues...
, Mikael Pettersson
, (Sat May 3, 11:58 am)
Re: i387/FPU init issues...
, H. Peter Anvin
, (Sat May 3, 12:03 pm)
Re: i387/FPU init issues...
, H. Peter Anvin
, (Sat May 3, 12:08 pm)
Re: i387/FPU init issues...
, Thomas Gleixner
, (Sat May 3, 12:17 pm)
Re: i387/FPU init issues...
, H. Peter Anvin
, (Sat May 3, 12:24 pm)
Re: i387/FPU init issues...
, Maciej W. Rozycki
, (Sat May 3, 12:49 pm)
Re: i387/FPU init issues...
, Ingo Molnar
, (Sat May 3, 12:54 pm)
Re: i387/FPU init issues...
, H. Peter Anvin
, (Sat May 3, 12:56 pm)
Re: i387/FPU init issues...
, H. Peter Anvin
, (Sat May 3, 1:03 pm)
Re: i387/FPU init issues...
, H. Peter Anvin
, (Sat May 3, 1:06 pm)
Re: i387/FPU init issues...
, Mikael Pettersson
, (Sat May 3, 1:07 pm)
Re: i387/FPU init issues...
, Maciej W. Rozycki
, (Sat May 3, 2:17 pm)
Re: i387/FPU init issues...
, jamal
, (Sat May 3, 2:46 pm)
Re: i387/FPU init issues...
, Arjan van de Ven
, (Sun May 4, 1:24 pm)
Re: i387/FPU init issues...
, H. Peter Anvin
, (Sun May 4, 2:07 pm)
Re: i387/FPU init issues...
, Jan Engelhardt
, (Sun May 4, 2:31 pm)
Re: i387/FPU init issues...
, H. Peter Anvin
, (Sun May 4, 2:37 pm)
Re: i387/FPU init issues...
, Lennart Sorensen
, (Mon May 5, 6:00 am)
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