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Date:   Mon, 18 Feb 2019 13:22:42 +0100
From:   Greg KH <>
To:     Alakesh Haloi <>
Cc:, "David S. Miller" <>,
        Alexey Kuznetsov <>,
        Hideaki YOSHIFUJI <>,
        Eric Dumazet <>,,
Subject: Re: [PATCH] tcp: Namespace-ify sysctl_tcp_rmem and sysctl_tcp_wmem

On Thu, Feb 14, 2019 at 01:12:08AM +0000, Alakesh Haloi wrote:
> [ Upstream commit 356d1833b638bd465672aefeb71def3ab93fc17d ]
> Note that when a new netns is created, it inherits its
> sysctl_tcp_rmem and sysctl_tcp_wmem from initial netns.
> This change is needed so that we can refine TCP rcvbuf autotuning,
> to take RTT into consideration.
> Signed-off-by: Eric Dumazet <>
> Cc: Wei Wang <>
> Signed-off-by: David S. Miller <>
> [alakeshh: backport to v4.14: The patch does not apply to v4.14
> directly and hence needed manual backport. Function signature for
> the function tcp_select_initial_window had to be changed to be able
> to pass pointer to struct sock.]
> Signed-off-by: Alakesh Haloi <>

Like Sasha said, why is this needed in 4.14.y?  It looks like a new
feature.  What is keeping you from just using 4.19.y if you want this


greg k-h

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