8f069b1a90
The following implements support for instantiation of 8MB D-TLB entries for the kernel direct virtual mapping on 8xx, thus reducing TLB space consumed for the kernel. Test used: writing 40MB from /dev/zero to file in ext2fs over RAMDISK. $ time dd if=/dev/zero of=file bs=4k count=10000 VANILLA 8MB kernel data pages real 0m11.485s real 0m11.267s user 0m0.218s user 0m0.250s sys 0m8.939s sys 0m9.108s real 0m11.518s real 0m10.978s user 0m0.203s user 0m0.222s sys 0m9.585s sys 0m9.138s real 0m11.554s real 0m10.967s user 0m0.228s user 0m0.222s sys 0m9.497s sys 0m9.127s real 0m11.633s real 0m11.286s user 0m0.214s user 0m0.196s sys 0m9.529s sys 0m9.134s and averages for both: real 11.54750 real 11.12450 Which is a 3.6% improvement in execution time. More improvement is expected for loads with larger kernel data footprint (real workloads). Signed-off-by: Marcelo Tosatti <marcelo.tosatti@cyclades.com> Signed-off-by: Paul Mackerras <paulus@samba.org> |
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| .. | ||
| 4xx_io | ||
| 8xx_io | ||
| 8260_io | ||
| amiga | ||
| boot | ||
| configs | ||
| kernel | ||
| lib | ||
| math-emu | ||
| mm | ||
| platforms | ||
| syslib | ||
| xmon | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||