netdev - Re: [PATCH net-next] tcp: gso: fix truesize tracking

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Message-ID: <CAMEtUuyj_ax49nz+LtkO-0=8=BH4v3tY34X=gkgiUZ_EiZXb-Q@mail.gmail.com>
Date:	Fri, 25 Oct 2013 18:46:26 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, stephen@...workplumber.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: gso: fix truesize tracking

On Fri, Oct 25, 2013 at 5:26 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> From: Eric Dumazet <edumazet@...gle.com>
>
> commit 6ff50cd55545 ("tcp: gso: do not generate out of order packets")
> had an heuristic that can trigger a warning in skb_try_coalesce(),
> because skb->truesize of the gso segments were exactly set to mss.
>
> This breaks the requirement that
>
> skb->truesize >= skb->len + truesizeof(struct sk_buff);
>
> It can trivially be reproduced by :
>
> ifconfig lo mtu 1500
> ethtool -K lo tso off
> netperf
>
> As the skbs are looped into the TCP networking stack, skb_try_coalesce()
> warns us of these skb under-estimating their truesize.
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Alexei Starovoitov <ast@...mgrid.com>
> ---

it fixed it in my setup. Thanks!
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