linux-kernel - Re: [RESEND PATCH net-next] virtio-net: switch to use XPS to choose txq

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Message-Id: <20131105.222203.740870236265138632.davem@davemloft.net>
Date:	Tue, 05 Nov 2013 22:22:03 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jasowang@...hat.com
Cc:	rusty@...tcorp.com.au, mst@...hat.com,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH net-next] virtio-net: switch to use XPS to
 choose txq

From: Jason Wang <jasowang@...hat.com>
Date: Tue,  5 Nov 2013 18:19:45 +0800

> We used to use a percpu structure vq_index to record the cpu to queue
> mapping, this is suboptimal since it duplicates the work of XPS and
> loses all other XPS functionality such as allowing user to configure
> their own transmission steering strategy.
> 
> So this patch switches to use XPS and suggest a default mapping when
> the number of cpus is equal to the number of queues. With XPS support,
> there's no need for keeping per-cpu vq_index and .ndo_select_queue(),
> so they were removed also.
> 
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Acked-by: Rusty Russell <rusty@...tcorp.com.au>
> Acked-by: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
> Resend since the previous complie warning disappears after commit
> 3573540cafa4296dd60f8be02f2aecaa31047525
> (netif_set_xps_queue: make cpu mask const).

Yep, looks great, applied.  Thanks Jason!
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