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

[Herbert Xu]

On Fri, Mar 13, 2009 at 07:19:51PM -0700, David Miller wrote:
> From: Tom Herbert <therbert@xxxxxxxxxx>
> 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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