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From: David Miller <davem@davemloft.net>
Subject: Re: [RFC] loopback: optimization
Date: Wed, 05 Nov 2008 01:49:18 -0800 (PST)
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From: Eric Dumazet <dada1@cosmosbay.com>
Date: Tue, 04 Nov 2008 07:36:48 +0100

> So are you sure you use the right one (&lo->napi, not &pcpu->napi) ?

Yes I think this logic error in Stephen's patch might
explain why it had no effect.

Stephen please try with lo->napi replaced with pcpu->napi
here.