On 2012-11-14, Lon Willett <x_soek...@lonw.net> wrote: > On Mon, 12 Nov 2012 13:51:54 +0100 > Mitja Muženič<mi...@muzenic.net> wrote: >>>> I don't know how it is with other operating systems but it's safe to >>>> presume that unless your OS actively sets the CPU to the high speed >>>> state your net6501-50 and net6501-70 units will be severely >>>> underclocked. > > So linux has been lying to me: my net6501-70 CPU is really running at > 600 MHz. That explains why it's so slow with its (fortunately rare) CPU > intensive tasks.
This is because the TSC (timestamp counter) used to calculate cpu speed is run at a constant rate in these newer Intel CPUs (indicated by the constant_tsc flag in Linux /proc/cpuinfo, or CTSC in the cpu attach line in very recent OpenBSD -current),unless the OS knows how to handle this, it will report the maximum cpu speed, so you don't see that it was running at a lower rate. http://anoncvs.estpak.ee/cgi-bin/cgit/openbsd-src/commit/?id=4b2a0a3689f8b7eb014d69d959ba537e89339103 _______________________________________________ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech
