Subject: Re: [PATCH net v4] tcp: fix mishandling when the sack compression is deferred.

From: [email-masked]
Date: Thu, 01 Jun 2023 11:30:19 +0000

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <[email-masked]>:

On Wed, 31 May 2023 16:01:50 +0800 you wrote:
> In this patch, we mainly try to handle sending a compressed ack
> correctly if it's deferred.
> 
> Here are more details in the old logic:
> When sack compression is triggered in the tcp_compressed_ack_kick(),
> if the sock is owned by user, it will set TCP_DELACK_TIMER_DEFERRED
> and then defer to the release cb phrase. Later once user releases
> the sock, tcp_delack_timer_handler() should send a ack as expected,
> which, however, cannot happen due to lack of ICSK_ACK_TIMER flag.
> Therefore, the receiver would not sent an ack until the sender's
> retransmission timeout. It definitely increases unnecessary latency.
> 
> [...]

Here is the summary with links:
  - [net,v4] tcp: fix mishandling when the sack compression is deferred.
    https://git.kernel.org/netdev/net/c/30c6f0bf9579

You are awesome, thank you!
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