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Date:   Sun, 15 Dec 2019 12:15:10 -0800
From:   Jakub Kicinski <>
To:     Eric Dumazet <>
Cc:     "David S . Miller" <>,
        netdev <>,
        Eric Dumazet <>,
        Arjun Roy <>,
        Soheil Hassas Yeganeh <>
Subject: Re: [PATCH net-next v2] tcp: Set rcv zerocopy hint correctly if skb
 last frag is < PAGE_SIZE

On Sun, 15 Dec 2019 11:54:51 -0800, Eric Dumazet wrote:
> From: Arjun Roy <>
> At present, if the last frag of paged data in a skb has < PAGE_SIZE
> data, we compute the recv_skip_hint as being equal to the size of that
> frag and the entire next skb.
> Instead, just return the runt frag size as the hint.
> recv_skip_hint is used by the application to skip over
> bytes that can not be mmaped, so returning a too big
> chunk is pessimistic and forces more bytes to be copied.
> Signed-off-by: Arjun Roy <>
> Acked-by: Soheil Hassas Yeganeh <>
> Signed-off-by: Eric Dumazet <>

Applied, thank you!!

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