Re: 3.2GHz processor weirdness

Hello,

On Tue, 01 Mar 2005 12:23:22 +0200
"J.P. Delport" <[email protected]> wrote:

> Hello,
> 
> I've recently tried to use rtlinux-3.2-rc1 from cvs on a new machine. 
> The machine has an Intel P4 processor on an Abit IC7 M/B (875P chipset).
> 
> I compiled a vanilla 2.4.27 kernel, patched with bigphysarea and rtlinux 
> under Debian, gcc-2.95.4.
> 
> The 'make regression' fails the 'thread wait times' and 'Linux time is 
> monotonically increasing' tests before it just idles inside the floating 
> point test.
> 
> Also when I run 'scripts/insrtl' the modules are inserted, but the PC 
> starts behaving funny: when I type in X, a single character press is 
> sometimes shown multiple times, as if the keyboard got stuck. When the 
> system bell sounds, it does not stop again.
> 
> When I change the processor speed in the BIOS to 1.6GHz (100*16 instead 
> of 200*16), the regression tests all pass and I do not get the funny 
> keyboard and speaker.
> 
> Does anyone know what can cause this behaviour? Also, what is the 
> preferred setting for APIC in both the BIOS and the kernel config?
> 
> regards
> jp

You may take a look at my old post here:
<http://hq.fsmlabs.com/pipermail/rtl/2004-March/013463.html>

I've seen schedulers/i386/rtl_time.c in 3.2-rc1 CVS, and "NLOOPS" is
still 50, which is too high for 3.0+GHz CPU, I think (or, this problem
is addressed/fixed at other place?).

=================================
Masahiro ABE, A&D Co., Ltd. Japan


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