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Date: Tue, 1 Jul 2003 14:28:36 -0400 (EDT)
From: Jeff Roberson <jroberson@chesapeake.net>
To: Andrew Gallatin <gallatin@cs.duke.edu>
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cc: current@freebsd.org
Subject: Re: ULE problems on HTT SMP
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On Mon, 30 Jun 2003, Andrew Gallatin wrote:

>
> Jeff Roberson writes:
>  > On Fri, 27 Jun 2003, John Baldwin wrote:
>  >
>  > >
>  > > On 27-Jun-2003 Andrew Gallatin wrote:
>  > > >
>  > > > Jeff Roberson writes:
>  > > >  >
>  > > >  > Can you call kseq_print(0) and kseq_print(1) from ddb?
>  > > >  >
>  > > >
>  > > > I found a different problem which is nearly as interesting.
>  > > > Note that ps thinks sysctl is on cpu 255...
>  > >
>  > > #define NOCPU   0xff            /* For when we aren't on a CPU. (SMP) */
>  > >
>  > > So that isn't but so interesting. :)
>  >
>  > The problem is that the logical cpu halting code does not put the halted
>  > CPU in the stopped cpus set.  ULE has no way of knowing that it can not
>  > migrate a thread to this cpu.  I'd prefer it if you could make this change
>  > John, but I can certainly do it if you're busy.
>  >
>
> Does this mean that if, as a temporary measure, I disable
> machdep.cpu_idle_hlt, ULE should work for me?
>
Yes, but it needs to be disabled before booting so you'll have to adjust
it in the code.  See i386/i386/mp_machdep.c

Cheers,
Jeff