netdev - Re: [PATCH v5] rps: Receive Packet Steering

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Date:	Sat, 16 Jan 2010 02:11:33 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Tom Herbert <therbert@...gle.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH v5] rps: Receive Packet Steering

On Thu, 2010-01-14 at 14:56 -0800, Stephen Hemminger wrote:
> On Thu, 14 Jan 2010 13:56:23 -0800 (PST)
> Tom Herbert <therbert@...gle.com> wrote:
[...]
> > The CPU masks is set on a per device basis in the sysfs variable
> > /sys/class/net/<device>/rps_cpus.  This is a set of canonical bit maps for
> > each NAPI nstance of the device.  For example:
> > 
> > echo "0b 0b0 0b00 0b000" > /sys/class/net/eth0/rps_cpus
> 
> Why not make a kobject out of cpus which would add subdirectory.
> This would keep interface consistent with the one value per file
> semantic of sysfs.

Do you mean a kobject per NAPI context, each initially with a rps_cpus
attribute holding a CPU mask, or a kobject per CPU, each with an
attribute specifying which NAPI contexts it does work for?  (Personally
I'd favour the first.)

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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