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8f069b1a90
linux/arch/ppc
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Marcelo Tosatti 8f069b1a90 [PATCH] powerpc/8xx: Use 8MB D-TLB's for kernel static mapping faults 
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>
2006-01-14 11:14:27 +11:00
..
4xx_io [PATCH] capable/capability.h (arch/) 2006-01-11 18:42:14 -08:00
8xx_io [PATCH] kfree cleanup: arch 2005-11-07 07:54:06 -08:00
8260_io [PATCH] ppc: fix-up schedule_timeout() usage 2005-11-07 07:53:56 -08:00
amiga [PATCH] m68k: kill mach_floppy_setup, convert to proper __setup() in drivers 2006-01-12 09:09:05 -08:00
boot [PATCH] ppc32: Put cache flush routines back into .relocate_code section 2006-01-09 15:47:08 +11:00
configs [PATCH] ppc32: Add TQM85xx (8540/8541/8555/8560) board support 2006-01-09 14:53:08 +11:00
kernel [PATCH] powerpc/8xx: Use 8MB D-TLB's for kernel static mapping faults 2006-01-14 11:14:27 +11:00
lib ppc32: use L1_CACHE_SHIFT/L1_CACHE_BYTES 2005-10-17 11:50:32 +10:00
math-emu [PATCH] powerpc: Fix handling of fpscr on 64-bit 2005-10-27 20:48:50 +10:00
mm [PATCH] ppc32 8xx: update_mmu_cache() needs unconditional tlbie 2005-11-16 13:28:22 +11:00
platforms [PATCH] powerpc: Updated platforms that use gianfar to match driver 2006-01-13 21:16:18 +11:00
syslib [PATCH] powerpc: Updated platforms that use gianfar to match driver 2006-01-13 21:16:18 +11:00
xmon [PATCH] scheduler cache-hot-autodetect 2006-01-12 09:08:50 -08:00
Kconfig [PATCH] powerpc: Updated Kconfig and Makefiles for 83xx support 2006-01-11 15:35:29 +11:00
Kconfig.debug [PATCH] ppc32: mv64x60 updates & enhancements 2005-09-05 00:06:00 -07:00
Makefile kbuild: remove GCC_VERSION 2006-01-08 19:58:51 +01:00