linux-kernel - Re: [RFC] packet: change call of synchronize_net to call

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Message-Id: <20120904.123833.1657238734473790349.davem@davemloft.net>
Date:	Tue, 04 Sep 2012 12:38:33 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	danborkmann@...earbox.net
Cc:	iulius.curt@...il.com, edumazet@...gle.com, xemul@...allels.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dbaluta@...acom.com, icurt@...acom.com, sdumitru@...acom.com
Subject: Re: [RFC] packet: change call of synchronize_net to call_rcu

From: Daniel Borkmann <danborkmann@...earbox.net>
Date: Tue, 4 Sep 2012 16:53:06 +0200

> On Tue, Sep 4, 2012 at 4:16 PM, Iulius Curt <iulius.curt@...il.com> wrote:
>> synchronize_net is called every time we close a PF_PACKET socket which is
>> causing performance loss when doing this on many sockets.
> 
> Do you have any particular use case in mind?

I'm curious about this too, it seems rediculous to optimize for this
and that only seriously mis-designed userspace would do something like
this.

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