github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-29 17:43:52 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

skbuff: Add MSG_MORE flag to optimize tcp large packet transmission

Browse Source 
When using sockmap for forwarding, the average latency for different packet sizes
after sending 10,000 packets is as follows:
size    old(us)         new(us)
512     56              55
1472    58              58
1600    106             81
3000    145             105
5000    182             125

Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Feng Yang <yangfeng@kylinos.cn>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250708054053.39551-1-yangfeng59949@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Feng Yang 2025-07-08 13:40:53 +08:00 committed by Jakub Kicinski
parent fb60457629
commit 76d727ae02
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
net/core/skbuff.c
View File

@ -3230,6 +3230,7 @@ typedef int (*sendmsg_func)(struct sock *sk, struct msghdr *msg);
static int __skb_send_sock(struct sock *sk, struct sk_buff *skb, int offset,
int len, sendmsg_func sendmsg, int flags)
{
int more_hint = sk_is_tcp(sk) ? MSG_MORE : 0;
unsigned int orig_len = len;
struct sk_buff *head = skb;
unsigned short fragidx;
@ -3247,6 +3248,8 @@ static int __skb_send_sock(struct sock *sk, struct sk_buff *skb, int offset,
kv.iov_len = slen;
memset(&msg, 0, sizeof(msg));
msg.msg_flags = MSG_DONTWAIT | flags;
if (slen < len)
msg.msg_flags |= more_hint;
iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &kv, 1, slen);
ret = INDIRECT_CALL_2(sendmsg, sendmsg_locked,
@ -3287,6 +3290,8 @@ static int __skb_send_sock(struct sock *sk, struct sk_buff *skb, int offset,
flags,
};
if (slen < len)
msg.msg_flags |= more_hint;
bvec_set_page(&bvec, skb_frag_page(frag), slen,
skb_frag_off(frag) + offset);
iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1,