netdev - Re: Shall we add some note info for tcp_min_snd

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Message-ID: <564a6863-0db9-a07b-0cfc-b41ea8e9c9f8@gmail.com>
Date:   Wed, 3 Jul 2019 11:34:50 +0200
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     ZhangXiao <xiao.zhang@...driver.com>, edumazet@...gle.com,
        davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: Re: Shall we add some note info for tcp_min_snd_mss?



On 7/3/19 1:35 AM, ZhangXiao wrote:
> Hi David & Eric,
> 
> Commit 5f3e2bf0 (tcp: add tcp_min_snd_mss sysctl) add a new interface to
> adjust network. While if this variable been set too large, for example
> larger then (MTU - 40), the net link maybe damaged. So, how about adding
> some warning messages for the operator/administrator? In document, or in
> source code.

What kind of warning message do you 
envision exactly ?

The sysctl is global, devices MTU can be quite arbitrary.

Like almost all sysctls, sysadmins are supposed to know what they are doing.