netdev - Re: [PATCH net-next 0/4] new mechanism to ACK immediately

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Message-Id: <20180811.114153.663666446120670168.davem@davemloft.net>
Date:   Sat, 11 Aug 2018 11:41:53 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     ycheng@...gle.com
Cc:     edumazet@...gle.com, netdev@...r.kernel.org, ncardwell@...gle.com,
        brakmo@...com, weiwan@...gle.com
Subject: Re: [PATCH net-next 0/4] new mechanism to ACK immediately

From: Yuchung Cheng <ycheng@...gle.com>
Date: Thu,  9 Aug 2018 09:38:08 -0700

> This patch is a follow-up feature improvement to the recent fixes on
> the performance issues in ECN (delayed) ACKs. Many of the fixes use
> tcp_enter_quickack_mode routine to force immediate ACKs. However the
> routine also reset tracking interactive session. This is not ideal
> because these immediate ACKs are required by protocol specifics
> unrelated to the interactiveness nature of the application.
> 
> This patch set introduces a new flag to send a one-time immediate ACK
> without changing the status of interactive session tracking. With this
> patch set the immediate ACKs are generated upon these protocol states:
> 
> 1) When a hole is repaired
> 2) When CE status changes between subsequent data packets received
> 3) When a data packet carries CWR flag

This looks really nice, series applied.

Thanks!