On Thu, 22 Sep 2005 11:19:37 -0300 sauro <sauro@xxxxxxxxxxx> wrote: > I am actually working on an MPC5200 (Freescale PowerPC) with Denx > embedded linux distribution, and there is no rdtsc avaiable... :( > And we are getting problems with gettimeofday, because of timer > desynchronization with the time server... and jiffies can't get the > desired precision in our application. > So that's why I am trying to use get_cycles. Was it a bad idea? It's just not worth the trouble. What I'm suggesting is just copy get_cycles() from your architecture-specific implementation in your application. I assume it's not based on any kernel-specific mechanism as most architectures have dedicated registers for this kind of stuff. Just pick your architecture from the list and dig into the get_cycles() code: http://lxr.linux.no/ident?i=get_cycles It's probably this one? http://lxr.linux.no/source/include/asm-ppc/timex.h#L24 Florin -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
