Subject: Re: ixgbe, don't assume mapping of numa node cpus

From: Prarit Bhargava <[email-masked]>
Date: Tue, 25 Feb 2014 12:43:05 -0500

On 02/25/2014 12:27 PM, Amir Vadai wrote:
> On 24/02/14 13:51 -0500, Prarit Bhargava wrote:
>> The ixgbe driver assumes that the cpus on a node are mapped 1:1 with the
>> indexes into arrays.  This is not the case as nodes can contain, for
>> example, cpus 0-7, 33-40.
>>
>> This patch fixes this problem.
>>
>> Signed-off-by: Prarit Bhargava <[email-masked]>
>> Cc: Jeff Kirsher <[email-masked]>
>> Cc: Jesse Brandeburg <[email-masked]>
>> Cc: Bruce Allan <[email-masked]>
>> Cc: Carolyn Wyborny <[email-masked]>
>> Cc: Don Skidmore <[email-masked]>
>> Cc: Greg Rose <[email-masked]>
>> Cc: Alex Duyck <[email-masked]>
>> Cc: John Ronciak <[email-masked]>
>> Cc: Mitch Williams <[email-masked]>
>> Cc: "David S. Miller" <[email-masked]>
>> Cc: [email-masked]
>> Cc: [email-masked]
>> Cc: [email-masked]
>> ---
> 
> Hi,
> 
> I'm just about to send tomorrow a patch to add an helper function to
> get affinity_hint suggestion by numa_node and ring index.
> If you'd like you will be able to use it too here.
> 
> We're still doing internal review on it before sending to the mailing
> list, but this will be the declaration of the function:
> /*
>  * netif_set_rx_queue_affinity_hint - set affinity hint of rx queue
>  * @rxq: index of rx queue
>  * @numa_node: prefered numa_node
>  * @affinity_mask: the relevant cpu bit is set according to the policy
>  *
>  * This function sets the affinity_mask according to a numa aware policy.
>  * affinity_mask coulbe used as an affinity hint for the IRQ related of this
>  * rx queue.
>  * The policy is to spread rx queues across cores - local cores first.
>  *
>  * Returns 0 on success, or a negative error code.
>  */
> int netif_set_rx_queue_affinity_hint(int rxq, int numa_node,
>                                      cpumask_var_t affinity_mask);

I'm going to wait for this patch then.  Amir, please cc me.

Thanks for the info,

P.

> Amir

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