Re: [net-next,v3] ipv6: shorten reassembly timeout under fragment memory pressure

[Fernando Fernandez Mancera <fmancera@suse.de>]

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 <soukjin.bae@samsung.com>
> 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 <soukjin.bae@samsung.com>

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.