Re: Intel P6 vs P7 system call performance

Linus Torvalds
2002-12-17T19:49:40Z

On Tue, 17 Dec 2002, Richard B. Johnson wrote:
>
> You can call intersegment with a full pointer. I don't know how
> expensive that is.

It's so expensive as to not be worth it, it's cheaper to load a register
or something, i eyou can do

pushl $0xfffff000
call *(%esp)

faster than doing a far call.

Linus