Re: Intel P6 vs P7 system call performance

Dave Jones
2002-12-17T00:56:51Z

On Mon, Dec 16, 2002 at 04:47:00PM -0800, Linus Torvalds wrote:

Cool, new toys 8-) I'll have a play with this tomorrow.
after a quick glance, one thing jumped out at me.

> +static int __init sysenter_setup(void)
> +{
> + if (!boot_cpu_has(X86_FEATURE_SEP))
> + return 0;
> +
> + enable_sep_cpu(NULL);
> + smp_call_function(enable_sep_cpu, NULL, 1, 1);
> + return 0;

I'm sure I recall seeing errata on at least 1 CPU re sysenter.
If we do decide to go this route, we'll need to blacklist ones
with any really icky problems.

Dave

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| Dave Jones. http://www.codemonkey.org.uk
| SuSE Labs