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

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Date:	Tue, 25 Feb 2014 12:43:05 -0500
From:	Prarit Bhargava <prarit@...hat.com>
To:	Amir Vadai <amirv@...lanox.com>
CC:	netdev@...r.kernel.org, Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Mitch Williams <mitch.a.williams@...el.com>,
	"David S. Miller" <davem@...emloft.net>, nhorman@...hat.com,
	agospoda@...hat.com, e1000-devel@...ts.sourceforge.net,
	idos@...lanox.com, Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>
Subject: Re: ixgbe, don't assume mapping of numa node cpus



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 <prarit@...hat.com>
>> Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
>> Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>
>> Cc: Bruce Allan <bruce.w.allan@...el.com>
>> Cc: Carolyn Wyborny <carolyn.wyborny@...el.com>
>> Cc: Don Skidmore <donald.c.skidmore@...el.com>
>> Cc: Greg Rose <gregory.v.rose@...el.com>
>> Cc: Alex Duyck <alexander.h.duyck@...el.com>
>> Cc: John Ronciak <john.ronciak@...el.com>
>> Cc: Mitch Williams <mitch.a.williams@...el.com>
>> Cc: "David S. Miller" <davem@...emloft.net>
>> Cc: nhorman@...hat.com
>> Cc: agospoda@...hat.com
>> Cc: e1000-devel@...ts.sourceforge.net
>> ---
> 
> 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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