Ingo Molnar wrote:
nor can the TSC really be synced up properly in the hotplug CPU case,
after the fact - what if the app already read out an older TSC value and
a new CPU is added. If the TSC isnt sync on SMP then it quickly gets
pretty messy, and we should rather take a look at /why/ these apps are
using RDTSC.
I've been using RDTSC in pktgen. For my app, I am just trying to find a
quick
way to determine if X nano-seconds have elapsed. If it's occasionally
off by a small amount,
that is OK as I have higher-level control logic that will correct
long-term trends.
After poking around, I ended up just exporting sched_clock() and using that
instead of directly using RDTSC, but that was mostly just for convenience.
If RDTSC is not a good choice for the use I describe above, is there a
better
method that is still very fast (as compared to do_gettimeofday())?
Thanks,
Ben
--
Ben Greear <[email protected]>
Candela Technologies Inc http://www.candelatech.com
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