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From: Bart Duchesne <bd@able.be>
To: netfilter@lists.netfilter.org
Subject: iptables performance
Date: Thu, 15 Feb 2007 20:48:55 +0100	[thread overview]
Message-ID: <1171568935.13409.26.camel@burnout.office.dyndaco.com> (raw)

Hi,

We are running kernel 2.6.17 and using iptables 1.3.5 and are observing
a performance problem.

We have a netfilter firewall consisting of about 800 Chains and a total
of 10000 rules (iptables -nvL | wc -l).

A single iptables manipulation takes about 4 seconds (on a PIV 2Ghz with
1Gb DDR2 ram).

With the same firewall config (on slower hardware) in a 2.4.24 kernel
with iptables 1.2.9 the single iptables manip takes about 500ms.

I traced the iptables command in 2.6.17 and noticed that the 4 seconds
are actually lost in the setsockopt call to write the BLOB back to the
kernel (BLOB size 2Mb ; 11000 entries).

Does anyone has any idea what might be causing this slowdown ?
Has the kernel interface part changed dramatically between 2.4 and 2.6 ?
Is it correct to say that no traffic will pass through in those 4
seconds that the filter is updated ?


regards,

Bart Duchesne 

--
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             reply	other threads:[~2007-02-15 19:48 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-15 19:48 Bart Duchesne [this message]
  -- strict thread matches above, loose matches on Subject: below --
2005-05-25 19:20 iptables performance Martin Schiøtz
2005-05-25 21:25 ` Jason Opperisano
2005-05-26  9:22   ` Martin Schiøtz
     [not found] <4104105C.4040306@switzer.org>
2004-07-30  8:15 ` IPTables Performance Harald Welte

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