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. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
