linux-kernel - Re: [PATCH 18/29] netfilter: notify about NF

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Message-ID: <45E06A86.2060408@trash.net>
Date:	Sat, 24 Feb 2007 17:40:38 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	netdev@...r.kernel.org,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Thomas Graf <tgraf@...g.ch>, David Miller <davem@...emloft.net>
Subject: Re: [PATCH 18/29] netfilter: notify about NF_QUEUE vs	emergency	skbs

Peter Zijlstra wrote:
> On Sat, 2007-02-24 at 17:17 +0100, Patrick McHardy wrote:
> 
> 
>>I don't really see why
>>queueing is special though, dropping the packets in the ruleset
>>will break things just as well, as will routing them to a blackhole.
>>I guess the user just needs to be smart enough not to do this.
> 
> 
> Its user-space and no emergency packet may rely on user-space because it
> most likely is needed to maintain user-space.

I believe I might have misunderstood the intention of this patch.

Assuming the user is smart enough not to queue packets destined
to a SOCK_VMIO socket, are you worried about unrelated packets
allocated from the emergency reserve not getting freed fast
enough because they're sitting in a queue? In that case simply
dropping the packets would be fine I guess.

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