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Date: Mon, 9 Apr 2012 18:45:11 +0300
From: Jaakko Heinonen <jh@FreeBSD.org>
To: "Justin T. Gibbs" <gibbs@FreeBSD.org>
Message-ID: <20120409154510.GA2253@a91-153-116-96.elisa-laajakaista.fi>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org
Subject: Re: svn commit: r233961 - head/sys/x86/x86
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Hi,

On 2012-04-06, Justin T. Gibbs wrote:
>   Fix interrupt load balancing regression, introduced in revision
>   222813, that left all un-pinned interrupts assigned to CPU 0.
>   
>   sys/x86/x86/intr_machdep.c:
>   	In intr_shuffle_irqs(), remove CPU_SETOF() call that initialized
>   	the "intr_cpus" cpuset to only contain CPU0.
>   
>   	This initialization is too late and nullifies the results of calls
>   	the intr_add_cpu() that occur much earlier in the boot process.
>   	Since "intr_cpus" is statically initialized to the empty set, and
>   	all processors, including the BSP, already add themselves to
>   	"intr_cpus" no special initialization for the BSP is necessary.

My Pentium 4 system hangs on boot after this commit. These are the last
lines from a verbose boot:

SMP: AP CPU #1 Launched!
cpu1 AP:
     ID: 0x01000000   VER: 0x00050014 LDR: 0x00000000 DFR: 0xffffffff
  lint0: 0x00010700 lint1: 0x00000400 TPR: 0x00000000 SVR: 0x000001ff
  timer: 0x000100ef therm: 0x00010000 err: 0x000000f0 pmc: 0x00010400

The system boots with r233960.

Some information:

CPU: Intel(R) Pentium(R) 4 CPU 2.60GHz (2605.96-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf29  Family = f  Model = 2  Stepping =
9
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Features2=0x4400<CNXT-ID,xTPR>
real memory  = 2147483648 (2048 MB)
avail memory = 2085228544 (1988 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <A M I  OEMAPIC >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
FreeBSD/SMP: 1 package(s) x 1 core(s) x 2 HTT threads
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP/HT): APIC ID:  1

-- 
Jaakko