netdev - Re: [PATCH] tcp: remove obsolete paramter sysctl_tcp_low

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Date:   Thu, 7 Jan 2021 18:45:38 +0100
From:   Florian Westphal <fw@...len.de>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     lll <liyonglong@...natelecom.cn>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        davem@...emloft.net, fw@...len.de, soheil@...gle.com,
        ncardwell@...gle.com, ycheng@...gle.com
Subject: Re: [PATCH] tcp: remove obsolete paramter sysctl_tcp_low_latency

Jakub Kicinski <kuba@...nel.org> wrote:
> > Got it. But a question: why tcp_tw_recycle can be removed totally?
> > it is also part of uAPI
> 
> Good question, perhaps with tcp_tw_recycle we wanted to make sure users
> who depended on it notice removal, since the feature was broken by
> design? 
> 
> tcp_low_latency is an optimization, not functionality which users may
> depend on.
> 
> But I may be wrong so CCing authors.

I guess it was just a case of 'noone noticed'.
I'm not sure if anyone would notice dropping lowlatency sysctl, was just
a case of 'overly careful'.  Personally I'd rather have them gone so
'sysctl tcp.bla' shows if the feature exists/does something.