I asked BDE about the same thing off-list: Yes, the debug options (INVARIANTS and WITNESS, especially the latter) slow down the kernel by a factor of 10 or so. Only progams that don't make many syscalls run reasonably fast. I only turn on these options for debugging (not often). Without them, syscalls should be an average of only (sigh) about 10% slower in -current.
--- "M. Warner Losh" <[EMAIL PROTECTED]> wrote: > In message: <p05101401b88638b62611@[128.113.24.47]> > Garance A Drosihn <[EMAIL PROTECTED]> > writes: > : Could it be due to the DDB, INVARIANTS & WITNESS > options in the > : kernel? If it is that's fine with me, I'm just > wondering where > : that magnitude of a slowdown would be coming from. > > No way for DDB, Maybe for Invariants, almost > certainly for witness. > WITNESS is slow and tends to exagerate lock > contention stalls (or so > it seems). > > Warner > > To Unsubscribe: send mail to [EMAIL PROTECTED] > with "unsubscribe freebsd-current" in the body of > the message > > __________________________________________________ Do You Yahoo!? Send FREE Valentine eCards with Yahoo! Greetings! http://greetings.yahoo.com To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
