Re: [PATCH RESEND net-next v3 1/2] tcp: add TCP_RFC7323_TW_PAWS drop reason

Eric Dumazet
2025-04-08T14:16:51Z

On Mon, Apr 7, 2025 at 4:00 PM Jiayuan Chen <jiayuan.chen@linux.dev> wrote:
>
> PAWS is a long-standing issue, especially when there are upstream network
> devices, making it more prone to occur.

This sentence is quite confusing. I do not think PAWS is an issue at all.

>
> Currently, packet loss statistics for PAWS can only be viewed through MIB,
> which is a global metric and cannot be precisely obtained through tracing
> to get the specific 4-tuple of the dropped packet. In the past, we had to
> use kprobe ret to retrieve relevant skb information from
> tcp_timewait_state_process().

>
> Suggested-by: Eric Dumazet <edumazet@google.com>
> Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>

Reviewed-by: Eric Dumazet <edumazet@google.com>