netdev - Re: [PATCH] NET : tcp_memory_pressure and tcp_socket are__read

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Message-Id: <20070327.135852.69409418.davem@davemloft.net>
Date:	Tue, 27 Mar 2007 13:58:52 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] NET : tcp_memory_pressure and tcp_socket
 are__read_mostly candidates

From: Eric Dumazet <dada1@...mosbay.com>
Date: Tue, 27 Mar 2007 15:25:13 +0200

> 
> tcp_memory_pressure and tcp_socket currently share a cache line with tcp_memory_allocated, tcp_sockets_allocated.
> (Very hot cache line)
> It makes sense to declare these variables as __read_mostly, to avoid false sharing on SMP.
> 
> ffffffff8081d9c0 B tcp_orphan_count
> ffffffff8081d9c4 B tcp_memory_allocated
> ffffffff8081d9c8 B tcp_sockets_allocated
> ffffffff8081d9cc B tcp_memory_pressure
> ffffffff8081d9d0 b tcp_md5sig_users
> ffffffff8081d9d8 b tcp_md5sig_pool
> ffffffff8081d9e0 b warntime.31570
> ffffffff8081d9e8 b tcp_socket
> 
> Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

Thanks for spotting this Eric, patch applied, thanks!
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