Re: SNB PCI root information

From: Yinghai Lu <yinghai@kernel.org>
To: Brice Goglin <brice.goglin@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	Ulrich Drepper <drepper@gmail.com>,
	jbarnes@virtuousgeek.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	lenb@kernel.org, x86@kernel.org, linux-pci@vger.kernel.org
Subject: Re: SNB PCI root information
Date: Fri, 22 Jun 2012 13:41:35 -0700	[thread overview]
Message-ID: <CAE9FiQUOWjLz86JZQrN-v1PdKfLAV022CPrjeArmYM5bRD+drA@mail.gmail.com> (raw)
In-Reply-To: <4FE4D7B7.8000004@gmail.com>

On Fri, Jun 22, 2012 at 1:38 PM, Brice Goglin <brice.goglin@gmail.com> wrote:
> Le 22/06/2012 19:28, Yinghai Lu a écrit :
>> On Fri, Jun 22, 2012 at 12:14 AM, Brice Goglin <brice.goglin@gmail.com> wrote:
>>
>>>> BIOS _PXM return 0 for both pci root buses?
>>>>
>>> Here's dmesg.
>>> I can't say for sure whether _PXM returns 0 since I don't know how to
>>> read all this :) But Linux puts the first socket cpumap in
>>> /sys/bus/pci/devices/*/local_cpus (and that's wrong according to the
>>> motherboard manual and according to the performance we see).
>>>
>> hi, looks like you system bios does not provide _PXM for the root bus.
>>
>
> So why does Linux say that all buses are close to socket 0 instead of
> close to everything as usual?

        if (bus && node != -1) {
#ifdef CONFIG_ACPI_NUMA
                if (pxm >= 0)
                        dev_printk(KERN_DEBUG, &bus->dev,
                                   "on NUMA node %d (pxm %d)\n", node, pxm);
#else
                dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
#endif
        }

so can you boot with "debug ignore_loglevel" ?

Thanks

Yinghai