Date: Fri, 13 Mar 2009 19:19:51 -0700 (PDT)
Message-Id: <20090313.191951.228619450.davem@davemloft.net>
To: therbert@google.com
Cc: yanmin_zhang@linux.intel.com, bhutchings@solarflare.com,
       andi@firstfloor.org, netdev@vger.kernel.org,
       linux-kernel@vger.kernel.org, herbert@gondor.apana.org.au,
       jesse.brandeburg@intel.com, shemminger@vyatta.com
Subject: Re: [RFC v2: Patch 1/3] net: hand off skb list to other cpu to
 submit to upper layer
From: David Miller <davem@davemloft.net>
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From: Tom Herbert <therbert@google.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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