From: Prarit Bhargava <prarit@redhat.com>
To: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: herbert@gondor.apana.org.au, bruce.w.allan@intel.com,
qat-linux@intel.com, john.griffin@intel.com,
linux-crypto@vger.kernel.org, naleksan@redhat.com,
davem@davemloft.net
Subject: Re: [PATCH 2/2] crypto: qat - Enforce valid numa configuration.
Date: Wed, 08 Oct 2014 15:01:26 -0400 [thread overview]
Message-ID: <54358A06.2080605@redhat.com> (raw)
In-Reply-To: <54358918.7030808@intel.com>
On 10/08/2014 02:57 PM, Tadeusz Struk wrote:
> On 10/08/2014 11:35 AM, Prarit Bhargava wrote:
>>> But then how do I know which node I'm physically connected to?
>> The pci_dev maps to the bus which maps to a numa node. The pci_dev's numa value
>> is copied directly from the bus (or busses depending on how deep it is).
>>
>> I'd argue (strongly) that the pci_dev's numa ID better be correct o/w that is a
>> FW bug (and a bad one at that these days).
>>
>> dev_to_node() should return the correct value.
>
> I'm not saying that the dev_to_node() returns incorrect value. It will
> always return the closest numa node for the given device.
No that isn't correct. dev_to_node() will return the node the device is
connected to.
> What we want to enforce is that the closest numa node is the node that
> the device is physically connected to. In case if the closest numa node
> is the remote node we don't want to use this accelerator.
>
P.
next prev parent reply other threads:[~2014-10-08 19:01 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-08 17:38 [PATCH 0/2] crypto: qat - Fix for invalid dma mapping and numa Tadeusz Struk
2014-10-08 17:38 ` [PATCH 1/2] crypto: qat - Prevent dma mapping zero length assoc data Tadeusz Struk
2014-10-08 17:38 ` [PATCH 2/2] crypto: qat - Enforce valid numa configuration Tadeusz Struk
2014-10-08 17:57 ` Prarit Bhargava
2014-10-08 18:11 ` Tadeusz Struk
2014-10-08 18:35 ` Prarit Bhargava
2014-10-08 18:57 ` Tadeusz Struk
2014-10-08 19:01 ` Prarit Bhargava [this message]
2014-10-08 19:25 ` Tadeusz Struk
2014-10-09 11:23 ` Prarit Bhargava
2014-10-09 16:14 ` Tadeusz Struk
2014-10-09 17:32 ` Prarit Bhargava
2014-10-09 19:55 ` Tadeusz Struk
2014-10-09 21:42 ` Prarit Bhargava
2014-10-09 23:12 ` Tadeusz Struk
2014-10-10 11:23 ` Prarit Bhargava
2014-10-10 13:25 ` Tadeusz Struk
2014-10-10 22:15 ` Prarit Bhargava
2014-10-11 17:05 ` Tadeusz Struk
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