From: Jakub Kicinski <kuba@kernel•org>
To: Leon Hwang <leon.hwang@linux•dev>
Cc: "Leon Hwang" <leon.huangfu@shopee•com>,
netdev@vger•kernel.org, "David S . Miller" <davem@davemloft•net>,
"Eric Dumazet" <edumazet@google•com>,
"Paolo Abeni" <pabeni@redhat•com>,
"Simon Horman" <horms@kernel•org>,
"Jonathan Corbet" <corbet@lwn•net>,
"Shuah Khan" <skhan@linuxfoundation•org>,
"David Ahern" <dsahern@kernel•org>,
"Neal Cardwell" <ncardwell@google•com>,
"Kuniyuki Iwashima" <kuniyu@google•com>,
"Ilpo Järvinen" <ij@kernel•org>,
"Ido Schimmel" <idosch@nvidia•com>,
kerneljasonxing@gmail•com, lance.yang@linux•dev,
jiayuan.chen@linux•dev, linux-doc@vger•kernel.org,
linux-kernel@vger•kernel.org
Subject: Re: [RFC PATCH net-next] tcp: Add net.ipv4.tcp_purge_receive_queue sysctl
Date: Mon, 2 Mar 2026 16:22:51 -0800 [thread overview]
Message-ID: <20260302162251.733b520e@kernel.org> (raw)
In-Reply-To: <f611be70-8280-44c8-86af-5866c0b302be@linux.dev>
On Mon, 2 Mar 2026 17:55:59 +0800 Leon Hwang wrote:
> On 26/2/26 09:43, Jakub Kicinski wrote:
> > On Wed, 25 Feb 2026 15:46:33 +0800 Leon Hwang wrote:
> >> Issue:
> >> When a TCP socket in the CLOSE_WAIT state receives a RST packet, the
> >> current implementation does not clear the socket's receive queue. This
> >> causes SKBs in the queue to remain allocated until the socket is
> >> explicitly closed by the application. As a consequence:
> >>
> >> 1. The page pool pages held by these SKBs are not released.
> >
> > On what kernel version and driver are you observing this?
>
> # uname -r
> 6.19.0-061900-generic
>
> # ethtool -i eth0
> driver: mlx5_core
> version: 6.19.0-061900-generic
> firmware-version: 26.43.2566 (MT_0000000531)
Okay... this kernel + driver should just patiently wait for the page
pool to go away.
What is the actual, end user problem that you're trying to solve?
A few kB of data waiting to be freed is not a huge problem..
next prev parent reply other threads:[~2026-03-03 0:22 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-25 7:46 [RFC PATCH net-next] tcp: Add net.ipv4.tcp_purge_receive_queue sysctl Leon Hwang
2026-02-25 8:31 ` Eric Dumazet
2026-02-25 9:48 ` Leon Hwang
2026-02-26 1:43 ` Jakub Kicinski
2026-03-02 9:55 ` Leon Hwang
2026-03-03 0:22 ` Jakub Kicinski [this message]
2026-03-03 2:12 ` Leon Hwang
2026-03-03 3:55 ` Eric Dumazet
2026-03-03 6:26 ` Leon Hwang
2026-03-03 7:55 ` Leon Hwang
2026-03-03 8:17 ` Eric Dumazet
2026-03-03 8:54 ` Leon Hwang
2026-03-03 8:56 ` Eric Dumazet
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