linux-kernel - Re: [RFC v2: Patch 1/3] net: hand off skb list to other cpu to submit to upper layer

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Message-Id: <20090313.140217.143696945.davem@davemloft.net>
Date:	Fri, 13 Mar 2009 14:02:17 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	therbert@...gle.com
Cc:	yanmin_zhang@...ux.intel.com, bhutchings@...arflare.com,
	andi@...stfloor.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, herbert@...dor.apana.org.au,
	jesse.brandeburg@...el.com, shemminger@...tta.com
Subject: Re: [RFC v2: Patch 1/3] net: hand off skb list to other cpu to
 submit to upper layer

From: Tom Herbert <therbert@...gle.com>
Date: Fri, 13 Mar 2009 13:58:53 -0700

> We are trying to follow the decisions scheduler as opposed to
> leading it.  This works on very loaded systems, with applications
> binding to cpusets, with threads that are receiving on multiple
> sockets.  I suppose it might be compelling if a NIC could steer
> packets per flow, instead of by a hash...

If the hash is good is will distribute the load properly.

If the NIC is sophisticated enough (Sun's Neptune chipset is)
you can even group interrupt distribution by traffic type
and even bind specific ports to interrupt groups.

I really detest all of these software hacks that add overhead
to solve problems the hardware can solve for us.
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