From: Eric Dumazet
Date: Fri, 19 Apr 2019 16:02:03 -0700
> tcp sendmsg() and sendpage() normally advance skb->data_len
> and skb->truesize by the payload added to an skb.
>
> But sendmsg(fd, ..., MSG_ZEROCOPY) has to account for whole pages,
> even if a single byte of payload is used in the page
On Fri, Apr 19, 2019 at 7:02 PM Eric Dumazet wrote:
>
> tcp sendmsg() and sendpage() normally advance skb->data_len
> and skb->truesize by the payload added to an skb.
>
> But sendmsg(fd, ..., MSG_ZEROCOPY) has to account for whole pages,
> even if a single byte of payload is used in the page.
>
>
tcp sendmsg() and sendpage() normally advance skb->data_len
and skb->truesize by the payload added to an skb.
But sendmsg(fd, ..., MSG_ZEROCOPY) has to account for whole pages,
even if a single byte of payload is used in the page.
This means that we can not assume skb->truesize can be adjusted
by
