netdev - Re: [PATCHv5] virtio-spec: virtio network device RFS support

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Message-ID: <1354827239.2828.36.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Thu, 6 Dec 2012 20:53:59 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Jason Wang <jasowang@...hat.com>, <rusty@...tcorp.com.au>,
	<virtualization@...ts.linux-foundation.org>,
	<netdev@...r.kernel.org>, <kvm@...r.kernel.org>
Subject: Re: [PATCHv5] virtio-spec: virtio network device RFS support

On Thu, 2012-12-06 at 22:29 +0200, Michael S. Tsirkin wrote:
> On Thu, Dec 06, 2012 at 08:03:14PM +0000, Ben Hutchings wrote:
[...]
> > Since this doesn't seem to be intended to have *any* connection with the
> > existing core networking feature called RFS, perhaps you could find a
> > different name for it.
> > 
> > Ben.
> 
> 
> Ah I see what you mean. We started out calling this feature "multiqueue"
> Rusty suggested "RFS" since it gives similar functionality to RFS but in
> device: it has receive steering logic per flow as part of the device.

The name is quite generic, but in the context of Linux it has so far
been used for a specific software feature and not as a generic name for
flow steering by hardware (or drivers).  The existing documentation
(Documentation/networking/scaling.txt) states quite clearly that 'RFS'
means that specific software implementation (with optional driver
integration) and configuration interface.

> Maybe simply adding a statement similar to the one above would be
> sufficient to avoid confusion?

No, I don't think it's sufficient.  We have documentation that says how
to configure 'RFS', and you're proposing to add a very similar feature
called 'RFS' that is configured differently.  No matter how clearly you
distinguish them in new documentation, this will make the old
documentation confusing.

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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