linux-kernel - Re: [net-next RFC V2 PATCH 0/5] Multiqueue support in tun/tap

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Date:	Mon, 19 Sep 2011 15:45:51 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	krkumar2@...ibm.com, eric.dumazet@...il.com, mst@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, davem@...emloft.net,
	kvm@...r.kernel.org, rusty@...tcorp.com.au, qemu-devel@...gnu.org,
	mirq-linux@...e.qmqm.pl, joe@...ches.com, shemminger@...tta.com
Subject: Re: [net-next RFC V2 PATCH 0/5] Multiqueue support in tun/tap

On Sat, 2011-09-17 at 14:02 +0800, Jason Wang wrote:
[...]
> 2 Current implementation may also get regression for single session
> packet transmission.
> 
> The reason is packets from each flow were not handled by the same
> queue/vhost thread.
> 
> Various method could be done to handle this:
> 
> 2.1 hack the guest driver, and store the queue index into the rxhash and
> use it when choosing tx in guest. This need some hack to store the
> rxhash into sk and pass it in to skb again in
> skb_orphan_try(). sk_rxhash is only used by RPS now, so some more
> clean method is needed.
[...]

I have previously suggested doing this as a general rule.  However, I
now think we can do much better with accelerated RFS and automatic XPS
(but the latter is not yet implemented).  For virtio_net, accelerated
RFS would effectively push the guest's RFS socket map out to the host.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
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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