netdev - Re: [PATCH] *icsk_ca_priv: Reduce inet_connection

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Date:	Sun, 31 Aug 2008 21:03:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	root@...ielinux.net
Cc:	netdev@...r.kernel.org, angelo.tornese@...il.com
Subject: Re: [PATCH] *icsk_ca_priv: Reduce inet_connection_sock size?

From: Daniele Lacamera <root@...ielinux.net>
Date: Sun, 31 Aug 2008 20:26:50 +0200

> This simple patch (2.6.26) replaces the icsk_ca_priv big array with a
> void pointer, reducing the default inet_connection_sock size by 60Bytes.
> 
> Each "congestion controlled" socket must allocate and free its own priv
> structure if needed, from the connection init and release callbacks
> inside each module.
> 
> Wouldn't this reduce memory usage for sockets that don't use ca?

Yes, but for every TCP socket there is a new memory allocation and
free.

We're trying to decrease the number of those rather than increase them
because having more of them non-trivially impacts TCP connection
rates.
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