netdev - Re: [PATCH net-next 02/12] tipc: Add "max

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Message-Id: <20130531.012922.204204156468438634.davem@davemloft.net>
Date:	Fri, 31 May 2013 01:29:22 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	erik.hugne@...csson.com
Cc:	paul.gortmaker@...driver.com, netdev@...r.kernel.org,
	jon.maloy@...csson.com, ying.xue@...driver.com
Subject: Re: [PATCH net-next 02/12] tipc: Add "max_ports" configuration
 parameter

From: Erik Hugne <erik.hugne@...csson.com>
Date: Fri, 31 May 2013 10:25:38 +0200

> On Thu, May 30, 2013 at 03:49:25PM -0700, David Miller wrote:
>> View compile time constants and module parameters as artificial
>> limits, they are terrible and unnecessary.
>> 
>> There is no reason you cannot restructure this table so that you
>> can dynamically size it at run time.
> 
> The TIPC ref table index is used directly as the port identity in the 
> TIPC publications. When a socket is bound, this ID is published to all 
> other nodes in the cluster.
> If we where to allow the table to be changed dynamically, we would need
> to change the port identities for already bound sockets/ports, withdraw
> the old identity and publish the new one.

No you do not, simply grow the table just like we dynamically grow
hash tables in response to network/socket activity elsewhere in the
kernel.  You'll only allocate new indexes from the newly allocated
area, the existing indexes will remain the same.

I really will accept no excuses for this limitation, especially if
the response is an ugly module paramter.

Thanks.

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