netdev - Re: [RFC Patch] tcp: make icsk_retransmit

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Message-ID: <CANn89iLhmbhaJDhPtThh2Nt8BMp1tnAZjBwwMdsk0V=SmkMJmQ@mail.gmail.com>
Date:   Fri, 1 Nov 2019 16:44:10 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC Patch] tcp: make icsk_retransmit_timer pinned

On Fri, Nov 1, 2019 at 3:43 PM Cong Wang <xiyou.wangcong@...il.com> wrote:

> So let's make the sysctl timer_migration disabled by default? It is
> always how we want to trade off CPU power saving with latency.

At least timer_migration sysctl deserves a proper documentation.
I do not see any.

And maybe automatically disable it for hosts with more than 64
possible cpus would make sense,
but that  is only a suggestion. I won't fight this battle.

(All sysctls can be set by admins, we do not need to change the default)