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| author | Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | 2005-10-31 01:59:25 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-31 04:37:11 +0300 |
| commit | dacb16b1a034fa7a0b868ee30758119fbfd90bc1 (patch) | |
| tree | daaa631c9c6fa2ad011647fb3acd219784faf2e2 /include/linux/devfs_fs_kernel.h | |
| parent | bfd51626cbf61cb23f787d8ff972ef0d5ddacc0b (diff) | |
| download | linux-dacb16b1a034fa7a0b868ee30758119fbfd90bc1.tar.xz | |
[PATCH] i386 and x86_64 TSC set_cyc2ns_scale imprecision
I just found out that some precision is unnecessarily lost in the
arch/i386/kernel/timers/timer_tsc.c:set_cyc2ns_scale function. It uses a
cpu_mhz parameter when it could use a cpu_khz. In the specific case of an
Intel P4 running at 3001.171 Mhz, the truncation to 3001 Mhz leads to an
imprecision of 19 microseconds per second : this is very sad for a timer with
nearly nanosecond accuracy.
Fix the x86_64 architecture too.
Cc: george anzinger <george@mvista.com>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/devfs_fs_kernel.h')
0 files changed, 0 insertions, 0 deletions