Linus Torvalds wrote:
>
> It should be eminently testable. Just remove the cli from the standard
> kernel, and do before-and-after tests.
>
#include <unistd.h>
main()
{
int i = 100 * 1000 * 1000;
while (i--)
getpid();
}
With cli:
./a.out 22.05s user 15.31s system 99% cpu 37.361 total
without cli:
./a.out 18.29s user 17.42s system 99% cpu 35.731 total
That's 4.6%. Intel P3.
It's also 306 cycles per iteration. So the cli added 14 cycles.
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This archive was generated by hypermail 2b29 : Thu Jan 31 2002 - 21:00:38 EST