Re: [Bugme-new] [Bug 11316] New: severe performance regression for iptables nat routing

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).

quoted

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.