Christoph Hellwig writes: > Am I missing something here or does this add a branch for every normal > syscall? It does, but the impact is so small as to be unmeasurable with lmbench, even on the null syscall measurement. The overhead of the easily-predicted not-taken branch is completely swamped by the amount of time that the sc and rfid instructions take. I had it under a config option at one point but then decided not to bother with that when I couldn't measure any difference. Paul. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html