linux-kernel - Re: the maxcpus= boot parameter broke somewhere along the line

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Message-ID: <20120306164835.GA26094@elliptictech.com>
Date:	Tue, 6 Mar 2012 11:48:35 -0500
From:	Nick Bowler <nbowler@...iptictech.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Jeff Moyer <jmoyer@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: the maxcpus= boot parameter broke somewhere along the line

On 2012-03-06 17:17 +0200, Sasha Levin wrote:
> On Tue, Mar 6, 2012 at 4:59 PM, Jeff Moyer <jmoyer@...hat.com> wrote:
> > When booting my machine with maxcpus=1, it seems to be ignored with
> > 3.3.0-rc3.  I know that 3.1.0-rc3 works fine, but I haven't had time to
> > track it down any further than that.  I've attached the dmesg from my
> > machine.  Let me know if there is any other information that would help
> > in solving this.
> 
> [snip]
> 
> > Brought up 1 CPUs
> > Total of 1 processors activated (4256.06 BogoMIPS).
> 
> Looks like it indeed brings up only one CPU, what's the problem there?

If you scroll further down it seems that the remaining CPUs are brought
online near the end of the boot?

  [...]
  udev: starting version 147
  SMP alternatives: switching to SMP code
  WARNING! power/level is deprecated; use power/control instead
  EDAC MC: Ver: 2.1.0
  Booting Node 0 Processor 3 APIC 0x3
  smpboot cpu 3: start_ip = 9a000
  EDAC MC0: Giving out device to 'i3200_edac' 'i3200': DEV 0000:00:00.0
  NMI watchdog enabled, takes one hw-pmu counter.
  Booting Node 0 Processor 2 APIC 0x1
  smpboot cpu 2: start_ip = 9a000
  NMI watchdog enabled, takes one hw-pmu counter.
  Booting Node 0 Processor 1 APIC 0x2
  smpboot cpu 1: start_ip = 9a000
  NMI watchdog enabled, takes one hw-pmu counter.

Cheers,
-- 
Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)

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