[Jool-list] Jool performance help

[ali at acreto.io]

Hi Alberto and Tore,

Thanks for your feedback.

I've done removed the modules using following

#rmmod jool
#rmmod jool_siit

Re inserted only jool_siit module using following (In global namespace)

#modprobe jool_siit no_instance

In Jool name space I did the following

ip netns exec nsJool  jool_siit --instance --add

ip netns exec nsJool  jool_siit --eamt --add 172.17.1.2 2001:db8::c60a:a03
ip netns exec nsJool  jool_siit --eamt --add 198.10.10.2 2001:db8::c60a:a02

Note: Ping and connectivity bw IPv4 and IPv6 host works fine.

Please find attached the "ethtool -k " output for interface. All the veth pairs have similar ethtool configurations.

Also find attached traffic capture on IPv6 interface of nsJool. I've observed a lot of TCP out of order and retransmissions.

Can you take a look at the configurations and provide your feedback on why could be there TCP out of order and retransmissions.

Appreciate your help

Thanks
Muhammad Ali

-----Original Message-----
From: Alberto Leiva <ydahhrk at gmail.com> 
Sent: Friday, July 13, 2018 12:09 AM
To: tore at fud.no
Cc: ali at acreto.io; jool-list at nic.mx
Subject: Re: [Jool-list] Jool performance help

Thanks, Tore!

I would like to add the following:

> $ modprobe jool
> $ modprobe jool_siit

Are you sure that this is what you want?

I'm not sure why you would want to insert both modules in the same namespace. One is a SIIT and the other one is a NAT64. Particularly if you're performance-testing, I'd normally expect you to test one *or* the other.
On Thu, Jul 12, 2018 at 2:09 AM Tore Anderson <tore at fud.no> wrote:
>
> * ali at acreto.io
>
> > I’ve installed Jool kernel modules and userspace application on Ubuntu. jool_siit is running in a network namespace and I’m using veth pairs for network I/O. Please find attached details of my test environment.
> >
> > However, while running the TCP throughput test, I was able to achieve only 6Mbps of throughput. I’ve tested it by doing both *GRO on and off* on all the relevant interfaces with no performance improvements.
> >
> > We are evaluating Jool for carrier grade NAT64 in our network infrastructure.
> >
> > I was wondering if you can help me to improve performance results. Is there any tweaks or workarounds to overcome the performance limitation by Jool.
>
> Hi Muhammad,
>
> First off, you're definitively not hitting the performance limit of 
> Jool - it easily scales to multiple Gb/s of throughput. There must be 
> something else that is causing your issues.
>
> Even though you said you turned GRO off, my suspicion would be 
> something with packet sizes. Are there other offload settings you can 
> turn off? MTU settings on all the interfaces are all okay?
>
> Also, check with tcpdump on all the relevant interfaces to see if the 
> test traffic is causing lots of ICMP Frag Needed/Packet Too Big errors.
>
> Tore
> _______________________________________________
> Jool-list mailing list
> Jool-list at nic.mx
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