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

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Date:	Fri, 31 May 2013 01:40:28 -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 10:34:55 +0200

> On Fri, May 31, 2013 at 01:29:22AM -0700, David Miller wrote:
>> 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.
> 
> And if someone tries to reduce the table size?
> Should we simply disallow that?

We never shrink the hash tables once we've grown them.  That's a
reasonable way to behave.
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