linux-kernel - Re: [PATCH net-next,v2] tcp: Set pingpong threshold via sysctl

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Date:   Tue, 10 Oct 2023 19:15:42 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Haiyang Zhang <haiyangz@...rosoft.com>
Cc:     Yuchung Cheng <ycheng@...gle.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "corbet@....net" <corbet@....net>,
        "dsahern@...nel.org" <dsahern@...nel.org>,
        "ncardwell@...gle.com" <ncardwell@...gle.com>,
        "kuniyu@...zon.com" <kuniyu@...zon.com>,
        "morleyd@...gle.com" <morleyd@...gle.com>,
        "mfreemon@...udflare.com" <mfreemon@...udflare.com>,
        "mubashirq@...gle.com" <mubashirq@...gle.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "weiwan@...gle.com" <weiwan@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next,v2] tcp: Set pingpong threshold via sysctl

On Tue, 10 Oct 2023 22:59:49 +0000
Haiyang Zhang <haiyangz@...rosoft.com> wrote:

> > > If this an application specific optimization, it should be in a socket option
> > > rather than system wide via sysctl.  
> > Initially I had a similar comment but later decided a sysctl could
> > still be useful if
> > 1) the entire host (e.g. virtual machine) is dedicated to that application
> > 2) that application is difficult to change  
> 
> Yes, the customer actually wants a global setting. But as suggested by Neal,
> I changed it to be per-namespace to match other TCP tunables.

Like congestion control choice, it could be both a sysctl and a socket option.
The reason is that delayed ack is already controlled by socket options.