From: Alex Williamson <alex.williamson@hp.com>
To: Patrick McHardy <kaber@trash.net>
Cc: David Miller <davem@davemloft.net>,
akpm@linux-foundation.org, buytenh@marvell.com,
netdev@vger.kernel.org, bugme-daemon@bugzilla.kernel.org
Subject: Re: [Bugme-new] [Bug 11316] New: severe performance regression for iptables nat routing
Date: Thu, 14 Aug 2008 09:08:04 -0600 [thread overview]
Message-ID: <1218726484.23510.20.camel@2710p.home> (raw)
In-Reply-To: <48A41139.9080509@trash.net>
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On Thu, 2008-08-14 at 13:04 +0200, Patrick McHardy wrote:
> I don't think so, its using skb_make_writable everywhere, which checks
> for skb_clone_writable, which should usually avoid COWing local TCP
> packets. It would also be unlikely to have that much of a performance
> impact (1MB/s -> 34kb/s).
>
> >
> > It seems, if anything, using GSO should make things go a little bit
> > faster not slower... Hmmm...
>
> Alex, could you post a tcpdump from both loopback and the outgoing
> device from the machine you're doing NAT on?
Attached, let me know if you want more options, this is just -vv -n.
The NAT'ing system is at 10.0.2.15 and the ssh tunnel target is
192.168.1.60. Thanks,
Alex
--
Alex Williamson HP Open Source & Linux Org.
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next prev parent reply other threads:[~2008-08-14 15:08 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-11316-10286@http.bugzilla.kernel.org/>
2008-08-13 5:12 ` [Bugme-new] [Bug 11316] New: severe performance regression for iptables nat routing Andrew Morton
2008-08-14 2:08 ` Alex Williamson
2008-08-14 2:21 ` David Miller
2008-08-14 11:04 ` Patrick McHardy
2008-08-14 15:08 ` Alex Williamson [this message]
2008-08-15 4:44 ` Herbert Xu
2008-08-15 5:35 ` Herbert Xu
2008-08-15 5:49 ` Alex Williamson
2008-08-15 6:17 ` Herbert Xu
2008-08-15 21:56 ` David Miller
[not found] ` <1218778238.23510.22.camel@2710p.home>
2008-08-15 7:33 ` Herbert Xu
2008-08-15 8:14 ` Herbert Xu
2008-08-15 10:32 ` Herbert Xu
2008-08-15 10:53 ` Herbert Xu
2008-08-15 15:34 ` Alex Williamson
2008-08-15 21:55 ` David Miller
2008-08-15 21:55 ` David Miller
2008-08-15 20:58 ` David Miller
2008-08-16 0:25 ` Herbert Xu
2008-08-15 21:54 ` David Miller
2008-08-14 22:00 ` David Miller
2008-08-15 4:34 ` Herbert Xu
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