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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2005-10-30 14:59:25 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 17:37:11 -0800
commitdacb16b1a034fa7a0b868ee30758119fbfd90bc1 (patch)
treedaaa631c9c6fa2ad011647fb3acd219784faf2e2 /include
parentbfd51626cbf61cb23f787d8ff972ef0d5ddacc0b (diff)
[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>
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