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Date:	Thu, 25 Jan 2007 23:14:49 +0100 (MET)
From:	Jan Engelhardt <>
To:	David Miller <>
Subject: Re: owner-Match in 2.6.20-rc5 (fwd)

>> >> The report below was posted on the netfilter user list. Isn't there any 
>> >> ill side effect by reverting the change?
>> >
>> >Performance regression :-(
>> >
>> >This optimization saves a whole handful of heavy atomic operations in
>> >the packet transmit path of TCP.
>> >
>> >As I understand it, the owner-Match is not in the upstream tree, and
>> >it's the only thing that cares, so I see no reason to cater for it.
>> For me, it's there.
>> -rw-r--r-- 1 jengelh users 2247 Jan 25 21:37
>> /erk/kernel/linux-2.6.20-rc6/net/ipv4/netfilter/ipt_owner.c
>Ok, I'll see what I can do about this :-)

People really depend on this. Much more than than pid/comm/smpunsafe stuff.
For example, a web server [cgi enabled, etc.] which also runs squid,
to force all webtraffic through it:

-A OUTPUT -p tcp --dport 80 -m owner ! --uid-owner
  squid -j REDIRECT --to-ports 3128

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