netdev - Re: [PATCH net-next] tcp: change default tcp hash size

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Message-Id: <20121201.113656.763210835116576607.davem@davemloft.net>
Date:	Sat, 01 Dec 2012 11:36:56 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: change default tcp hash size

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 30 Nov 2012 12:08:52 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> As time passed, available memory increased faster than number of
> concurrent tcp sockets. 
> 
> As a result, a machine with 4GB of ram gets a hash table
> with 524288 slots, using 8388608 bytes of memory.
> 
> Lets change that by a 16x factor (one slot for 128 KB of ram)
> 
> Even if a small machine needs a _lot_ of sockets, tcp lookups are now
> very efficient, using one cache line per socket.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Agreed, applied, thanks Eric.
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