Date: Fri, 06 Jul 2001 14:00:41 -0700 From: Mike Smith <msmith@freebsd.org> To: Peter Pentchev <roam@orbitel.bg> Cc: arch@FreeBSD.org, hardware@FreeBSD.org Subject: Re: New hw.cpuhz sysctl as per PR i386/27627 Message-ID: <200107062100.f66L0fa01267@mass.dis.org> In-Reply-To: Your message of "Fri, 06 Jul 2001 12:38:40 %2B0300." <20010706123840.A598@ringworld.oblivion.bg>
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CPU speeds aren't constants; this is probably not the right place to put
it. It also assumes there's only one CPU, which isn't acceptable.
It would be better to have a per-cpu "cupuinfo" struct, and populate it
from a variety of sources.
> Attached is a slight modification of the patch in PR i386/27627.
> Are there any downsides to implementing this? If not, how should
> it be extended to allow probing non-TSC/non-i386 timecounters?
>
> G'luck,
> Peter
>
> --
> "yields falsehood, when appended to its quotation." yields falsehood, when ap
> pended to its quotation.
>
> Index: src/sys/i386/isa/clock.c
> ===================================================================
> RCS file: /home/ncvs/src/sys/i386/isa/clock.c,v
> retrieving revision 1.174
> diff -u -r1.174 clock.c
> --- src/sys/i386/isa/clock.c 2001/05/15 23:22:21 1.174
> +++ src/sys/i386/isa/clock.c 2001/07/06 09:11:52
> @@ -146,6 +146,10 @@
> static u_int32_t i8254_lastcount;
> static u_int32_t i8254_offset;
> static int i8254_ticked;
> +static u_int cpuhz;
> +
> +SYSCTL_INT(_hw, OID_AUTO, cpuhz, CTLFLAG_RD, &cpuhz, 0, "CPU speed in Hz.");
> +
> /*
> * XXX new_function and timer_func should not handle clockframes, but
> * timer_func currently needs to hold hardclock to handle the
> @@ -664,7 +668,7 @@
> * similar to those for the i8254 clock.
> */
> if (tsc_present)
> - tsc_freq = rdtsc() - old_tsc;
> + cpuhz = tsc_freq = rdtsc() - old_tsc;
>
> if (bootverbose) {
> if (tsc_present)
>
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