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:	Fri, 13 Mar 2009 19:19:51 -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 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?
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