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: <20090314131951.GA6080@gondor.apana.org.au>
Date:	Sat, 14 Mar 2009 21:19:51 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	therbert@...gle.com, yanmin_zhang@...ux.intel.com,
	bhutchings@...arflare.com, andi@...stfloor.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	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

On Fri, Mar 13, 2009 at 07:19:51PM -0700, David Miller wrote:
> From: Tom Herbert <therbert@...gle.com>
> Date: Fri, 13 Mar 2009 17:24:10 -0700
> 
> > Enabling HW multi-queue has somewhat higher CPU
> > utilization though, the extra device interrupt load is not coming for
> > free.  We actually use the HW multi-queue in conjunction with our
> > software steering to get maximum pps (about 20% more).
> 
> This is a non-intuitive observation.  Using HW multiqueue should be
> cheaper than doing it in software, right?

Shared caches can play games with the numbers, we need to look
at this a bit more.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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