netdev - Re: [RFC PATCH net-next 3/3] virtio-net: Add accelerated RFS support

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Message-ID: <1389979208.27141.11.camel@bwh-desktop.uk.level5networks.com>
Date:	Fri, 17 Jan 2014 17:20:08 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Zhi Yong Wu <zwu.kernel@...il.com>
CC:	Stefan Hajnoczi <stefanha@...hat.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH net-next 3/3] virtio-net: Add accelerated RFS support

On Sat, 2014-01-18 at 00:54 +0800, Zhi Yong Wu wrote:
> On Fri, Jan 17, 2014 at 7:16 AM, Ben Hutchings
> <bhutchings@...arflare.com> wrote:
[...]
> > However, to take advantage of ARFS on a physical net driver, it would be
> > necessary to send a control request for part 2.
> aRFS on a physical net driver? What is this physical net driver? I
> thought that in order to enable aRFS, guest virtio_net driver should
> send a control request to its emulated virtio_net NIC.
[...]

If the backend is connected to a macvlan device on top of a physical net
device that supports ARFS, then there is further potential for improving
performance by steering to the best physical RX queue and CPU as well as
the best virtio_net RX queue and vCPU.

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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