netdev - Re: [PATCH] xps-mq: Transmit Packet Steering for multiqueue

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Date:	Mon, 23 Aug 2010 18:09:09 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH] xps-mq: Transmit Packet Steering for multiqueue

On Sun, 2010-08-22 at 22:39 -0700, Tom Herbert wrote:
[...]
> Each transmit queue can be associated with a number of CPUs which will
> used the queue to send packets.  This is configured as a CPU mask on a
> per queue basis in:
> 
> /sys/class/net/eth<n>/queues/tx-<n>/xps_cpus
> 
> The mappings are stored per device in an inverted data structure that
> maps CPUs to queues.  In the netdevice structure this is an array of
> num_possible_cpu structures where each array entry contains a bit map
> of queues which that CPU can use.
[...]

The mapping of TX queue to CPU should match the affinity of the
completion IRQ for that queue.  It should not be a separate setting.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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