Date: Wed, 08 Apr 2009 00:18:28 -0700 (PDT)
Message-Id: <20090408.001828.262566823.davem@davemloft.net>
To: shen@cn.fujitsu.com
Cc: bhutchings@solarflare.com, akpm@linux-foundation.org,
       netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] IPv4/IPv6: update sysctl files
From: David Miller <davem@davemloft.net>
In-Reply-To: <49DC19D5.7090101@cn.fujitsu.com>
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	<1239158863.11534.52.camel@deadeye.i.decadent.org.uk>
	<49DC19D5.7090101@cn.fujitsu.com>
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From: Shen Feng <shen@cn.fujitsu.com>
Date: Wed, 08 Apr 2009 11:28:21 +0800

> 
> 
> on 04/08/2009 10:47 AM, Ben Hutchings wrote:
>> On Wed, 2009-04-08 at 02:39 +0000, Shen Feng wrote:
>>> Now the following sysctl files in /proc/sys/net/ipv4 are used by
>>> both IPv4 and IPv6.
>>> tcp_mem  tcp_rmem  tcp_wmem
>>> udp_mem  udp_rmem_min  udp_wmem_min
>>> Putting them in /proc/sys/net/ipv4 is not a good choice.
>> [...]
>> 
>> But this is part of the ABI to userland.  You cannot remove sysctl files
>> without long advance notice documented in feature-removal-schedule.txt
>> (if at all).
>> 
>> If it is possible to add the paths
>> /proc/sys/net/{tcp,udp} while retaining aliases under /proc/sys/net/ipv4
>> then that might be a workable solution.
> 
> Thanks. That's a good solution.
> 
> But I'm still confused.
> Why not create another tcp_mem in /proc/sys/net/ipv6?

People just need to understand that ipv4 is always going to be
there and that's where all the tcp controls are.

I really am not going to entertain changes that try to move generic
inet sysctl things out of the ipv4 directory.  There is really no
point at all.

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