Re: [PATCH 5/5] examples/l3fwd: add neon support for l3fwd

["Sekhar, Ashwin" <Ashwin.Sekhar@cavium.com>]

On Fri, 2017-05-05 at 13:43 +0800, Jianbo Liu wrote:
> On 5 May 2017 at 12:24, Sekhar, Ashwin <Ashwin.Sekhar@cavium.com>
> wrote:
> > 
> > On Thu, 2017-05-04 at 16:42 +0800, Jianbo Liu wrote:
> > > 
> > > Hi Ashwin,
> > > 
> > > On 3 May 2017 at 13:24, Jianbo Liu <jianbo.liu@linaro.org> wrote:
> > > > 
> > > > 
> > > > Hi Ashwin,
> > > > 
> > > > On 2 May 2017 at 19:47, Sekhar, Ashwin <Ashwin.Sekhar@cavium.co
> > > > m>
> > > > wrote:
> > > > > 
> > > > > 
> > > > > Hi Jianbo,
> > > > > 
> > > > > I tested your neon changes on thunderx. I am seeing a
> > > > > performance
> > > > > regression of ~10% for LPM case and ~20% for EM case with
> > > > > your
> > > > > changes.
> > > > > Did you see improvement on any arm64 platform with these
> > > > > changes.
> > > > > If
> > > > > yes, how much was the improvement?
> > > > Thanks for your reviewing and testing.
> > > > For some reason, I have not done much with the performance
> > > > testing.
> > > > I'll send a new version later after tuning the performance.
> > > > 
> > > Can you tell me how did you test?
> > Built with following commands.
> > make config T=arm64-thunderx-linuxapp-gcc
> > make -j32
> > 
> > Tested LPM with
> > sudo ./examples/l3fwd/build/l3fwd -l 9,10  --master-lcore 9  -- -p
> > 0x1 --config="(0,0,10)"
> > 
> > Tested EM with
> > sudo ./examples/l3fwd/build/l3fwd -l 9,10  --master-lcore 9  -- -p
> > 0x1 --config="(0,0,10)" -E
> > 
> Only one port? What's the network topology, and lpm/em rules? How did
> you stress traffic...?
port - 1 topology: DUT connected back to back to traffic generator.

We are using the default rules in the C code. flow generation is:
src.ip.min 192.168.18.1
src.ip.max 192.168.18.90
src.ip.inc 1

Also, Please let us know the topology that you are using.
> 
> > 
> > > 
> > > My testing shows that EM case is much better, while LPM is almost
> > > the
> > > same as before.
> > Could you please tell on which arm64 processor/platform you tested.
> > Also how much was the percentage increase in performance for EM ?
> > 
> I'm sorry I can't tell you what's arm64 platform I tested on. But I
> can get a ThunderX, and replicate your testing environment if you can
> tell me more...
Thanks.
> 
> Thanks!
> Jianbo