netdev - Re: [PATCH] net: No more expensive sock_hold()/sock

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Message-Id: <20090604.022644.20820407.davem@davemloft.net>
Date:	Thu, 04 Jun 2009 02:26:44 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	rusty@...tcorp.com.au, netdev@...r.kernel.org
Subject: Re: [PATCH] net: No more expensive sock_hold()/sock_put() on each
 tx

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 04 Jun 2009 11:18:35 +0200

> Next step would be to get rid of sk_callback_lock, I dont remember
> if we already discussed about that rwlock, after RCUification of sockets...

We discussed it, but the RCU'ification of core socket destruction
is pretty expensive.  Just do any simple connection rate based
test, like lat_connection from lmbench, and the effects are clear.
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