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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Date:	Mon, 16 Mar 2009 11:20:37 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	Andi Kleen <andi@...stfloor.org>, netdev@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, herbert@...dor.apana.org.au,
	jesse.brandeburg@...el.com, shemminger@...tta.com,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC v2: Patch 1/3] net: hand off skb list to other cpu to
	submit  to upper layer

On Fri, 2009-03-13 at 10:06 -0700, Tom Herbert wrote:
> On Thu, Mar 12, 2009 at 11:43 PM, Zhang, Yanmin
> <yanmin_zhang@...ux.intel.com> wrote:
> >
> > On Thu, 2009-03-12 at 14:08 +0000, Ben Hutchings wrote:
> > > On Thu, 2009-03-12 at 16:16 +0800, Zhang, Yanmin wrote:
> > > > On Wed, 2009-03-11 at 12:13 +0100, Andi Kleen wrote:

> > > Yes, that's exactly what they do.  This feature is sometimes called
> > > Receive-Side Scaling (RSS) which is Microsoft's name for it.  Microsoft
> > > requires Windows drivers performing RSS to provide the hash value to the
> > > networking stack, so Linux drivers for the same hardware should be able
> > > to do so too.
> > Oh, I didn't know the background. I need study more about network.
> > Thanks for explain it.
> >
> 
> You'll definitely want to look at the hardware provided hash.  We've
> been using a 10G NIC which provides a Toeplitz hash (the one defined
> by Microsoft) and a software RSS-like capability to move packets from
> an interrupting CPU to another for processing.  The hash could be used
> to index to a set of CPUs, but we also use the hash as a connection
> identifier to key into a lookup table to steer packets to the CPU
> where the application is running based on the running CPU of the last
> recvmsg.
Your scenario is different from mine. My case is ip_forward which happens
in kernel and there is no application participating in the forwarding.

I might test the application communication on 10G NIC with my method later.


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