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| /freebsd-11-stable/sys/sparc64/sparc64/ | ||
| H A D | pmap.c | diff 113166 Sun Apr 06 15:05:26 MDT 2003 jake Use the vis block copy/zero functions for pmap_copy_page and pmap_zero_page. These are called through function pointers so that different implementations can be provided for cheetah, where the block load instructions may or may not be a win, and so they can be disabled with the machdep.use_vis tunable. In terms of raw bandwidth the integer versions are faster, but not allocating lines in the L2 cache for useless data gives a measurable improvement in user time for the benchmarks I tested (mostly buildworld with -j8). As far as I can tell the instructions used are implemented on everything back to UltraSPARC I, so there should not be a problem with different cpu types. |
| H A D | machdep.c | diff 113166 Sun Apr 06 15:05:26 MDT 2003 jake Use the vis block copy/zero functions for pmap_copy_page and pmap_zero_page. These are called through function pointers so that different implementations can be provided for cheetah, where the block load instructions may or may not be a win, and so they can be disabled with the machdep.use_vis tunable. In terms of raw bandwidth the integer versions are faster, but not allocating lines in the L2 cache for useless data gives a measurable improvement in user time for the benchmarks I tested (mostly buildworld with -j8). As far as I can tell the instructions used are implemented on everything back to UltraSPARC I, so there should not be a problem with different cpu types. |
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