netdev - Re: [PATCH net] tcp: remove 64 KByte limit for initial tp->rcv

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Date: Thu, 23 May 2024 10:40:28 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Jason Xing <kerneljasonxing@...il.com>
Cc: edumazet@...gle.com, dsahern@...nel.org, kuba@...nel.org,
 pabeni@...hat.com, davem@...emloft.net, ncardwell@...gle.com,
 netdev@...r.kernel.org, kernelxing@...cent.com
Subject: Re: [PATCH net] tcp: remove 64 KByte limit for initial tp->rcv_wnd value

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@...hat.com>:

On Tue, 21 May 2024 21:42:20 +0800 you wrote:
> From: Jason Xing <kernelxing@...cent.com>
> 
> Recently, we had some servers upgraded to the latest kernel and noticed
> the indicator from the user side showed worse results than before. It is
> caused by the limitation of tp->rcv_wnd.
> 
> In 2018 commit a337531b942b ("tcp: up initial rmem to 128KB and SYN rwin
> to around 64KB") limited the initial value of tp->rcv_wnd to 65535, most
> CDN teams would not benefit from this change because they cannot have a
> large window to receive a big packet, which will be slowed down especially
> in long RTT. Small rcv_wnd means slow transfer speed, to some extent. It's
> the side effect for the latency/time-sensitive users.
> 
> [...]

Here is the summary with links:
  - [net] tcp: remove 64 KByte limit for initial tp->rcv_wnd value
    https://git.kernel.org/netdev/net/c/378979e94e95

You are awesome, thank you!
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