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From: David Miller <davem@davemloft.net>
Subject: Re: [RFC] packet: change call of synchronize_net to call_rcu
Date: Tue, 04 Sep 2012 12:38:33 -0400 (EDT)
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From: Daniel Borkmann <danborkmann@iogearbox.net>
Date: Tue, 4 Sep 2012 16:53:06 +0200

> On Tue, Sep 4, 2012 at 4:16 PM, Iulius Curt <iulius.curt@gmail.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.