Re: Intel P6 vs P7 system call performance

Christian Leber (
Sun, 29 Dec 2002 03:05:10 +0100

On Sat, Dec 28, 2002 at 10:37:06PM +0200, Ville Herva wrote:

> Now that Linus has killed the dragon and everybody seems happy with the
> shiny new SYSENTER code, let just add one more stupid question to this
> thread: has anyone made benchmarks on SYSCALL/SYSENTER/INT80 on Athlon? Is
> SYSCALL worth doing separately for Athlon (and perhaps Hammer/32-bit mode)?

Yes, the output of the programm Linus posted is on a Duron 750 with
2.5.53 like this:

igor3:~# ./a.out
187.894946 cycles (call 0xffffe000)
299.155075 cycles (int 80)

(cycles per getpid() call)

Christian Leber

  "Omnis enim res, quae dando non deficit, dum habetur et non datur,
   nondum habetur, quomodo habenda est."       (Aurelius Augustinus)
  Translation: <>
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