>>>>> "Andi" == Andi Kleen <[email protected]> writes:
Anrd> - do_gettimeofday potentially slow, reliable TOD clock,
Anrd> microsecond resolution
>> Slow, not necessarily safe to call in IRQ context.
Andi> It's only slow if the platform can't do better. On good hardware
Andi> it is fast. And yes it is safe to call in IRQ
Andi> context. Networking does that all the time.
Thanks for the clarification.
I measured do_gettimeofday on IA64 at around 120 cycles (mind you that
was some time ago now, before the last lot of time function revisions
in the kernel). Whether that's slow or not depends on your application.
--
Dr Peter Chubb http://www.gelato.unsw.edu.au peterc AT gelato.unsw.edu.au
http://www.ertos.nicta.com.au ERTOS within National ICT Australia
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
