On Mon, Nov 07, 2005 at 09:35:59AM -0500, Dan Malek wrote: > > On Nov 7, 2005, at 3:44 AM, Marcelo Tosatti wrote: > > >Dan, I wonder why we just don't go back to v2.4 behaviour. It is not > >very > >clear to me that "two exception" speedup offsets the additional code > >required > >for "one exception" version. Have you actually done any measurements? > > No, and I didn't actually make these changes, either :-)
Ahh, ok. sorry. I remember you arguing that it was faster this way (less code). > I'm working on some 8xx debugging right now, so let's experiment > with some changes. I don't understand why other processors, especially > G2 cores like 82xx, aren't finding the same problems we are having > with 8xx. Logically, we are all doing the same thing, unless there are > some tlb invalidates on these other processors that I'm forgetting > about. I really dont know how the 82xx TLB works, so... > We just seem to be running into stale entries, and we have to fix it. Right - the issue Joakim noted would be one reason for the "two exception" approach.