Messages in this thread | | | Subject | Re: [RFC] x86-64: Use SSE for copy_page and clear_page | From | michael@optusnet ... | Date | 01 Jun 2005 17:22:28 +1000 |
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Andi Kleen <ak@muc.de> writes:
> > Thus with "normal" page clear and "nt" page copy routines > > both clear and copy benchmarks run faster than with > > stock kernel, both with small and large working set. > > > > Am I wrong? > > fork is only a corner case. The main case is a process allocating > memory using brk/mmap and then using it.
Key point: "using it". This normally involves writes to memory. Most applications don't commonly read memory that they haven't previously written to. (valgrind et al call that behaviour a "bug" :).
Given that, I'd say you really don't want the page zero routines touching the cache.
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