Date: Sun, 30 Sep 2001 09:39:21 -0500 From: Bob Willcox <bob@immure.com> To: Hassan Halta <hassan@cs.earlham.edu> Cc: freebsd-smp@FreeBSD.ORG Subject: Re: Zero % values for CPU and WCPU Message-ID: <20010930093921.A28955@luke.immure.com> In-Reply-To: <20010928012505.X52188-100000@quark.cs.earlham.edu>; from hassan@cs.earlham.edu on Fri, Sep 28, 2001 at 01:29:24AM -0500 References: <20010928012505.X52188-100000@quark.cs.earlham.edu>
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I have this problem on one of my older systems here. It's a dual 400 MHz
Xeon using an ASUS XG-DLS mb, running a 4.4-RC version of FreeBSD. This
board has always (since I originally assembled it over 2.5 years ago
now) done this. I am (still) running the following patch that I got from
Tor Egge that seems to "fix" it, though:
Index: clock.c
===================================================================
RCS file: /usr/cvs/FreeBSD/src/sys/i386/isa/clock.c,v
retrieving revision 1.149.2.3
diff -c -r1.149.2.3 clock.c
*** clock.c 2001/04/18 23:17:41 1.149.2.3
--- clock.c 2001/09/30 14:36:16
***************
*** 202,207 ****
--- 202,211 ----
static void
clkintr(struct clockframe frame)
{
+ #if 1 /* Patch from Tor Egge to keep rtc running */
+ while (rtcin(RTC_INTR) & RTCIR_PERIOD)
+ statclock(&frame);
+ #endif
if (timecounter->tc_get_timecount == i8254_get_timecount) {
disable_intr();
if (i8254_ticked)
This works for me (I've not noticed any ill effects from it) but YMMV.
Bob
On Fri, Sep 28, 2001 at 01:29:24AM -0500, Hassan Halta wrote:
> Hi all,
>
> I have a weird problem with top after having SMP enabled in the Kernel.
> Everything seems to be working just fine, except for stuff like top starts
> giving me weird errors with zero % of the CPU usage. I tried to hammer the
> CPU with some benchmarks, and see if that makes it get away from zero, but
> there was no hope. I even recomplied top, and things seem to be the same.
> Just a quick note, when I add "options NCPU=x" it says that NPU is an
> unknown command, which is totally weird.
>
> I am running FreeBSD 4.3 Stable. It is been a problem since I had FreeBSD
> 4.2 and I hoped that it would go away with 4.3, but I guess not.
>
> I hope that I can get some help with this!
>
> Thanks a lot,
> Hassan
>
>
>
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--
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bob@vieo.com Technology is dominated by two types of people:
Austin, TX Those who understand what they do not manage.
Those who manage what they do not understand.
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