Very Computer

using do_gettimeofday & timeval just can measure in microseconds

does there any patchs or methods help me to do this

thanks in advance

Ta'
Juergen

--
\ Real name     : Jrgen Heinzl                 \       no flames      /

Martijn

        Use Linux-2.2.11 and then add Ulrich Windl's 'NANO' patches. You can
find them in PPSkit-0.7.1 available from the various ftp.kernel.org
mirrors in pub/linux/daemons/ntp/pps

        You can then use 'ntp_gettime' to get a timespec, which has the time in
nanoseconds. Look in /usr/include/linux/timex.h

        It won't do much unless you:

        1) Have a Pentium or better processor.

        2) Disable any powersaving features such as APM.

        DS

Quote:>    Use Linux-2.2.11 and then add Ulrich Windl's 'NANO' patches. You can

typedef unsigned long long u64;

inline u64
rdtsc() {
    u64 clock;
    __asm__ __volatile__("rdtsc" : "=A" (clock));
    return clock;

Quote:}

--

        KAIST CS Dept, CA Lab.        Phone : 5552(Lab), 017-755-9413

        There's a lot of problems with this including at least:

        1) It will break horribly on SMP systems.

        2) It will break horribly on CPUs that don't have a cycle counter.

        3) It will provide, at best, 100ppm accuracy.

        DS