linux/arch
Clemens Ladisch 7811fb8f40 [PATCH] hpet-RTC: cache the comparator register
Reads from an HPET register require a round trip to the south bridge and are
almost as slow as PCI reads.  By caching the last value we've written to the
comparator register, we can eliminate all HPET reads from the fast path in the
emulated RTC interrupt handler.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 17:37:30 -08:00
..
alpha [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
arm [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
arm26 [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
cris [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
frv [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
h8300 [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
i386 [PATCH] hpet-RTC: cache the comparator register 2005-10-30 17:37:30 -08:00
ia64 [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
m32r [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
m68k [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
m68knommu [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
mips [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
parisc [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
ppc [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
ppc64 [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
s390 [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
sh [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
sh64 [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
sparc [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
sparc64 [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
um [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
v850 [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00
x86_64 [PATCH] hpet-RTC: cache the comparator register 2005-10-30 17:37:30 -08:00
xtensa [PATCH] jiffies_64 cleanup 2005-10-30 17:37:25 -08:00