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Wed, 11 Feb 2026 15:11:01 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id /PhTLwWcjGkLGgAAD6G6ig (envelope-from ); Wed, 11 Feb 2026 15:11:01 +0000 Message-ID: <207b2879-e022-4b50-837b-d536f8fcabcd@suse.de> Date: Wed, 11 Feb 2026 16:10:49 +0100 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [net-next,v3] ipv6: shorten reassembly timeout under fragment memory pressure To: soukjin.bae@samsung.com, "netdev@vger.kernel.org" Cc: "netfilter-devel@vger.kernel.org" , "davem@davemloft.net" , "edumazet@google.com" , "pabeni@redhat.com" , "dsahern@kernel.org" , "kuba@kernel.org" , "horms@kernel.org" , "phil@nwl.cc" , "coreteam@netfilter.org" , "fw@strlen.de" , "pablo@netfilter.org" References: <20260211103243epcms1p2dd304fd11b28df04f4e680e8c90a7fc5@epcms1p2> Content-Language: en-US From: Fernando Fernandez Mancera In-Reply-To: <20260211103243epcms1p2dd304fd11b28df04f4e680e8c90a7fc5@epcms1p2> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Score: -4.30 X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; FROM_HAS_DN(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FUZZY_RATELIMITED(0.00)[rspamd.com]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_EQ_ADDR_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCPT_COUNT_TWELVE(0.00)[13]; RCVD_COUNT_TWO(0.00)[2]; MID_RHS_MATCH_FROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:mid,samsung.com:email] X-Spam-Level: X-Spam-Flag: NO On 2/11/26 11:32 AM, 배석진 wrote: > Changes in v3: > - Fix build bot error and warnings > - baseline update > > > > From c7940e3dd728fdc58c8199bc031bf3f8f1e8a20f Mon Sep 17 00:00:00 2001 > From: Soukjin Bae > Date: Wed, 11 Feb 2026 11:20:23 +0900 > Subject: [PATCH] ipv6: shorten reassembly timeout under fragment memory > pressure > > Under heavy IPv6 fragmentation, incomplete fragment queues may persist > for the full reassembly timeout even when fragment memory is under > pressure. > > This can lead to prolonged retention of fragment queues that are unlikely > to complete, causing newly arriving fragmented packets to be dropped due > to memory exhaustion. > > Introduce an optional mechanism to shorten the IPv6 reassembly timeout > when fragment memory usage exceeds the low threshold. Different timeout > values are applied depending on the upper-layer protocol to balance > eviction speed and completion probability. > > Signed-off-by: Soukjin Bae Hello, isn't this what net.ipv6.ip6frag_time does? In addition, the situation you described could be overcome by increasing the memory thresholds at net.ipv6.ip6frag_low_thresh and net.ipv6.ip6frag_high_thresh. Please, let me know if I am missing something. Thanks, Fernando.