Hi Florian, I've made a screenshot of perf top when doing the NAT throughput test without the switch (which too doesn't work on 1000mbps as I thought, but on ~680 mbps). What do you think about the result?
http://blackhole.sk/~kabel/tmp/a3700_nat_perf.png Marek On Thu, 24 Jan 2019 13:31:24 -0800 Florian Fainelli <f.faine...@gmail.com> wrote: > On 1/24/19 12:26 PM, Marek Behun wrote: > > Hello, > > > > I am encountering strange performance issue when benchmarking NAT > > performance on Armada 3720 with Marvell 88e6190 switch. > > > > Download speed (from internet, via Armada 3720 NAT, via switch to > > LAN device) is ~750mbps and the CPU running on 100% (mostly in > > ksoftirq). Upload speed is ~250mbps. > > > > When the LAN device is connected to A3720 directly (via SFP), the > > speeds are both ~1000mbps. > > OK and that presumably uses the second Ethernet MAC on the SoC right? > > > > > I realize that packing/unpacking packets with Marvell header for the > > switch takes some time, but is such a performance drop expected? > > If you run perf top/record you would be able to see that pretty > quickly, I would not think that processing of the Marvell DSA tag > would incur such a high penalty though since the packets are already > hot in D$ by the time we get to mangle them for the DSA network > devices. > > How about pure (non-NAT) IP routing? How about just bridging between > WAN and LAN? > > > > > This was tested with 5.0.0-rc2 and also 4.14. > > > > Thank you. > > > > Marek > > >
