From: David Ahern <dsahern@kernel.org>
To: Eric Dumazet <edumazet@google.com>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>
Cc: Simon Horman <horms@kernel.org>,
Willem de Bruijn <willemb@google.com>,
Kuniyuki Iwashima <kuniyu@google.com>,
netdev@vger.kernel.org, eric.dumazet@gmail.com
Subject: Re: [PATCH net-next 05/10] udp: refine __udp_enqueue_schedule_skb() test
Date: Wed, 17 Sep 2025 09:39:30 -0600 [thread overview]
Message-ID: <c9cd9193-d0cd-4cc8-88cd-4fcc205bbeba@kernel.org> (raw)
In-Reply-To: <20250916160951.541279-6-edumazet@google.com>
On 9/16/25 10:09 AM, Eric Dumazet wrote:
> Commit 5a465a0da13e ("udp: Fix multiple wraparounds
> of sk->sk_rmem_alloc.") allowed to slightly overshoot
> sk->sk_rmem_alloc, when many cpus are trying
> to feed packets to a common UDP socket.
>
> This patch, combined with the following one reduces
> false sharing on the victim socket under DDOS.
>
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> ---
> net/ipv4/udp.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
Reviewed-by: David Ahern <dsahern@kernel.org>
next prev parent reply other threads:[~2025-09-17 15:39 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-16 16:09 [PATCH net-next 00/10] udp: increase RX performance under stress Eric Dumazet
2025-09-16 16:09 ` [PATCH net-next 01/10] ipv6: make ipv6_pinfo.saddr_cache a boolean Eric Dumazet
2025-09-17 14:59 ` Willem de Bruijn
2025-09-17 15:30 ` David Ahern
2025-09-17 17:56 ` Kuniyuki Iwashima
2025-09-16 16:09 ` [PATCH net-next 02/10] ipv6: make ipv6_pinfo.daddr_cache " Eric Dumazet
2025-09-17 14:59 ` Willem de Bruijn
2025-09-17 15:33 ` David Ahern
2025-09-17 17:57 ` Kuniyuki Iwashima
2025-09-16 16:09 ` [PATCH net-next 03/10] ipv6: np->rxpmtu race annotation Eric Dumazet
2025-09-17 14:59 ` Willem de Bruijn
2025-09-17 15:34 ` David Ahern
2025-09-17 17:59 ` Kuniyuki Iwashima
2025-09-16 16:09 ` [PATCH net-next 04/10] ipv6: reorganise struct ipv6_pinfo Eric Dumazet
2025-09-17 15:00 ` Willem de Bruijn
2025-09-17 15:36 ` David Ahern
2025-09-17 18:01 ` Kuniyuki Iwashima
2025-09-16 16:09 ` [PATCH net-next 05/10] udp: refine __udp_enqueue_schedule_skb() test Eric Dumazet
2025-09-17 15:00 ` Willem de Bruijn
2025-09-17 15:57 ` Eric Dumazet
2025-09-17 17:53 ` Kuniyuki Iwashima
2025-09-17 19:07 ` Willem de Bruijn
2025-09-17 15:39 ` David Ahern [this message]
2025-09-16 16:09 ` [PATCH net-next 06/10] udp: update sk_rmem_alloc before busylock acquisition Eric Dumazet
2025-09-17 15:01 ` Willem de Bruijn
2025-09-17 16:07 ` Eric Dumazet
2025-09-17 19:14 ` Willem de Bruijn
2025-09-17 15:44 ` David Ahern
2025-09-17 18:02 ` Kuniyuki Iwashima
2025-09-16 16:09 ` [PATCH net-next 07/10] net: group sk_backlog and sk_receive_queue Eric Dumazet
2025-09-17 15:01 ` Willem de Bruijn
2025-09-17 15:45 ` David Ahern
2025-09-17 18:11 ` Kuniyuki Iwashima
2025-09-16 16:09 ` [PATCH net-next 08/10] udp: add udp_drops_inc() helper Eric Dumazet
2025-09-17 15:02 ` Willem de Bruijn
2025-09-17 15:47 ` David Ahern
2025-09-17 18:13 ` Kuniyuki Iwashima
2025-09-16 16:09 ` [PATCH net-next 09/10] udp: make busylock per socket Eric Dumazet
2025-09-16 16:31 ` Willem de Bruijn
2025-09-16 17:10 ` Eric Dumazet
2025-09-16 19:15 ` Willem de Bruijn
2025-09-17 15:03 ` Willem de Bruijn
2025-09-17 15:52 ` David Ahern
2025-09-17 18:15 ` Kuniyuki Iwashima
2025-09-16 16:09 ` [PATCH net-next 10/10] udp: use skb_attempt_defer_free() Eric Dumazet
2025-09-17 15:03 ` Willem de Bruijn
2025-09-17 15:55 ` David Ahern
2025-09-17 16:15 ` Paolo Abeni
2025-09-17 16:32 ` Eric Dumazet
2025-09-18 6:38 ` Paolo Abeni
2025-09-17 18:20 ` Kuniyuki Iwashima
2025-10-13 21:44 ` [REGRESSION] xfrm issue bisected to 6471658dc66c ("udp: use skb_attempt_defer_free()") Michal Kubecek
2025-10-13 22:12 ` Eric Dumazet
2025-09-18 1:03 ` [PATCH net-next 00/10] udp: increase RX performance under stress Jakub Kicinski
2025-09-18 8:40 ` patchwork-bot+netdevbpf
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=c9cd9193-d0cd-4cc8-88cd-4fcc205bbeba@kernel.org \
--to=dsahern@kernel.org \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=eric.dumazet@gmail.com \
--cc=horms@kernel.org \
--cc=kuba@kernel.org \
--cc=kuniyu@google.com \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=willemb@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).