Maybe syscalls that only have to move a very small chunk of data
(gettimeofday(2), for instance), are hurt because of the wasted bytes they
are prefetching after the intended data? Also, for sizes greater than 512,
copy_to_user will call mmx_copy_user, which might call mmx_memcpy, which does
prefetching already on x86 CPUs that support it.
-Ryan
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