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Date:	Fri, 16 Mar 2012 01:52:30 -0700 (PDT)
From:	David Miller <>
Subject: Re: [PATCH net-next] asix: asix_rx_fixup surgery to reduce skb

From: Eric Dumazet <>
Date: Wed, 14 Mar 2012 23:18:32 -0700

> asix_rx_fixup() is complex, and does some unnecessary memory copies (at
> least on x86 where NET_IP_ALIGN is 0)
> Also, it tends to provide skbs with a big truesize (4096+256 with
> MTU=1500) to upper stack, so incoming trafic consume a lot of memory and
> I noticed early packet drops because we hit socket rcvbuf too fast.
> Switch to a different strategy, using copybreak so that we provide nice
> skbs to upper stack (including the NET_SKB_PAD to avoid future head
> reallocations in some paths)
> With this patch, I no longer see packets drops or tcp collapses on
> various tcp workload with a AX88772 adapter.
> Signed-off-by: Eric Dumazet <>

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