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Floating point broken between 2.4.0-ac4 and -ac5?

DISCUSSION [email protected] 3 participants 4 messages Jan 11, 2001 – Jan 12, 2001

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A Duron box running 2.4.0-ac5 (and -ac6) shows NaN in many places (such as df output showing usage "nan%"). Right now I reverted back to 2.4.0-ac4 which does not show the problem. The kernel was compiled with CONFIG_MK7 and without MATH_EMULATION, if that makes any difference.

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#1 lore raw
Quoted 5 lines

A Duron box running 2.4.0-ac5 (and -ac6) shows NaN in many places (such as df output showing usage "nan%"). Right now I reverted back to 2.4.0-ac4 which does not show the problem. The kernel was compiled with CONFIG_MK7 and without MATH_EMULATION, if that makes any difference.

If you boot with the nofxsr option does that fix the problem ?

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#2 lore raw
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"AC" == Alan Cox <[email protected]> writes:

A Duron box running 2.4.0-ac5 (and -ac6) shows NaN in many places (such as df output showing usage "nan%"). Right now I reverted back to 2.4.0-ac4 which does not show the problem. The kernel was compiled with CONFIG_MK7 and without MATH_EMULATION, if that makes any difference.

AC> If you boot with the nofxsr option does that fix the problem ?

Yes, it seems to fix it. I guess this is the same problem as Udo A Steinberg has reported earlier in ``XFree 4.0.2 and "w"'' thread Message-ID: <[email protected]>. -
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#3 lore raw
In reply to [email protected]
Quoted 5 lines · On Wed, Jan 10, 2001 at 08:58:00PM -0800, [email protected] wrote:

A Duron box running 2.4.0-ac5 (and -ac6) shows NaN in many places (such as df output showing usage "nan%"). Right now I reverted back to 2.4.0-ac4 which does not show the problem. The kernel was compiled with CONFIG_MK7 and without MATH_EMULATION, if that makes any difference.

I just had exactly the same problem with ac6 and an Athlon. Many floating point numbers were replaced with nan. XFree86 broke.