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SubjectRe: [PATCH net-next] skbuff: optimize the pull_pages code in __pskb_pull_tail()
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On Thu, 2017-07-06 at 17:01 +0800, Lin Zhang wrote:
> In the pull_pages code block, if the first frags size > eat,
> we can end the loop in advance to avoid extra copy.
>
> Signed-off-by: Lin Zhang <xiaolou4617@gmail.com>
> ---
> net/core/skbuff.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index f990eb8..c00a1df 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -1720,6 +1720,10 @@ void *__pskb_pull_tail(struct sk_buff *skb, int delta)
> skb_shinfo(skb)->frags[k].page_offset += eat;
> skb_frag_size_sub(&skb_shinfo(skb)->frags[k], eat);
> eat = 0;
> + if (!i) {
> + k = skb_shinfo(skb)->nr_frags;
> + break;
> + }
> }
> k++;
> }

1) net-next is closed during merge window.

2) This change is completely buggy.
How have you tested it exactly ???



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