Re: Intel P6 vs P7 system call performance

Alan Cox (
20 Dec 2002 03:05:15 +0000

On Wed, 2002-12-18 at 23:45, Pavel Machek wrote:
> IIRC, segment 0x40 was special in BIOS days, and some APM bioses
> blindly access 0x40 even from protected mode (windows have segment
> 0x40 with base 0x400....) Is that issue you are hitting?

Well the spec says it is not special. Windows leaves it pointing to
0x400 and if you don't do that your APM doesn't work.


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