netdev - Re: [PATCH net-next v3 1/2] RDS: TCP: Add sysctl tunables for sndbuf/rcvbuf on rds-tcp socket

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Date:	Wed, 16 Mar 2016 07:32:11 -0400
From:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	santosh.shilimkar@...cle.com, eric.dumazet@...il.com
Subject: Re: [PATCH net-next v3 1/2] RDS: TCP: Add sysctl tunables for
 sndbuf/rcvbuf on rds-tcp socket

On (03/16/16 12:26), Hannes Frederic Sowa wrote:
> 
> My hope was actually that by using the ->data pointer in netns you
> don't need to provide the two functions, just simply use something
> like the following for both cases.

Ok, it would probably be less hacky to do it as you suggest.

> Do I understand it correctly that all connections of a namespace
> will be dropped if you modify those sysctls?

yes. it's unfortunate, but afaict there's no other way to make them 
use the new vars.

But as I said in the comments, an admin who goes around creating
this churn is probably doing this very rarely, and for a good
reason, and is fully aware of the cost. So there is some degree 
of human control possible.

--Sowmini