Re: About Celeron processor memory barrier problem

From: Pavel Machek (pavel@suse.cz)
Date: Sat Dec 23 2000 - 17:34:48 EST

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Hi!

> diff -Nur linux/include/asm-i386/system.h linux.new/include/asm-i386/system.h
> --- linux/include/asm-i386/system.h Mon Dec 11 19:26:39 2000
> +++ linux.new/include/asm-i386/system.h Sat Dec 23 16:06:01 2000
> @@ -274,7 +274,14 @@
> #ifndef CONFIG_X86_XMM
> #define mb() __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory")
> #else
> -#define mb() __asm__ __volatile__ ("sfence": : :"memory")
> +#define mb() do { \
> + if ( cpu_has_xmm ) { \
~~~~~~~~~~~~~~~~~~

Cost of test may well be bigger than gain by using sfence...

Pavel

-- 
I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org
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Next message: kuznet@ms2.inr.ac.ru: "Re: test13-pre4 ip defrag oops"
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Next in thread: Giacomo Catenazzi: "Re: About Celeron processor memory barrier problem"
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