linux-kernel - Re: only a single core (out of 8) initialized

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20090604202933.d7c24c3d.akpm@linux-foundation.org>
Date:	Thu, 4 Jun 2009 20:29:33 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	david@...g.hm
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: only a single core (out of 8) initialized

On Thu, 4 Jun 2009 19:52:36 -0700 (PDT) david@...g.hm wrote:

> this is 2.6.30-rc7

Were any earlier kernels OK?

>  with a patch added to debug a nv sata driver 
> incompatibility with the Intel SSDs on a tyan motherboard
> 
> on one system it sees all 8 cores, on the other system it only initializes 
> one core.
> 
> can anyone help me spot what's going wrong in the one that's only seeing a 
> single core? If I'm reading things correctly it's seeing both sockets for 
> the NUMA setup, but then only initializing one core on the first socket.

good:
	SMP: Allowing 8 CPUs, 4 hotplug CPUs

bad:	
	SMP: Allowing 1 CPUs, 0 hotplug CPUs

perhaps due to
	ACPI: No APIC-table, disabling MPS

You could have a poke around in arch/x86/kernel/smpboot.c() and find
out what happened here.  I'd be suspecting this code triggered:

        /* no processor from mptable or madt */
        if (!num_processors)
                num_processors = 1;

because ACPI doesn't like that board.

Did you look into updating the BIOS?

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/