Messages in this thread | | | Date | Fri, 26 Nov 1999 17:33:55 +0100 (CET) | From | Ingo Molnar <> | Subject | Re: spin_unlock optimization(i386) |
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On Fri, 26 Nov 1999, Erich Boleyn wrote:
> > * you (speculatively) execute read instructions ahead of write > > instructions. > > * you do not send write instructions immediately out of the CPU core, > > they sit in a write buffer. > > I'm starting to doubt myself a bit here (reads being hoisted above writes > with respect to externally observed stores vs. conflicts with the list of > uncommitted stores as being the trouble here), so I'm going to just check > on this one with the folks who implemented it here...
my (fixed) test code doesnt show any causality violation. Manfred's code is a complex simulation of one given Linux code sequence, Manfred are you sure it's not buggy?
-- mingo
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