[OpenWrt-Devel] trying to acheive close to 1 Gbps with 802.11ac 3x3 mimo ath10k Compex wle900vx
David Johnson
david.lloyd.johnson at gmail.com
Sun Oct 7 20:12:15 EDT 2018
Just to close off this discussion - I did some final tests on two
different board to show the problem is clearly the CPU not keeping up
All tests performed with 3 simultaneous TCP streams using iperf, 80MHz
channel width, channel 48, and antennas arranged at 120 degrees, all
systems running 18.06 openwrt
Compex WPJ563 (Qualcomm Atheros QCA9563 74Kc MIPS processor, 64KB
I-Cache and 32 KB D-Cache, targeted to operate at 775MHz, 128MB ram,
16MB NOR flash), with Compex wle900vx card
* Internal iperf test to localhost: Max speed = 525Mbps
* Apple Mac air (with 802.11ac 3x3 MIMO) <-> compex
- Apple -> Compex: 305 Mbps
- Compex -> Apple: 125 Mbps
- CPU during test (56% used by iperf, 41% by ksoftirqd) .. its suffering
Espressobin (dual core ARM Cortex A53 processor up to 1.2GHz, 1GB ram,
..Marvell Armada 3700LP) with Compex wle900vx card
* Internal iperf test on localhost: Max speed - 3.49 Gbps
* Apple Mac air (with 802.11ac 3x3 MIMO) <-> Espressobin
- Apple -> Espressobin: 515 Mbps
- Espressobin -> Apple: 459 Mbps
- CPU during test ( 19% used by iperf -s -V, 12% by ksoftirqd) ...
not breaking a sweat
Raw 802.11ac 1.3Gbps (max TCP throughput of approx. 650 Mbps) ... so
the Espressobin is quite close
Cheers
David
On Sat, Oct 6, 2018 at 12:30 AM David Johnson
<david.lloyd.johnson at gmail.com> wrote:
>
> It looks like Ben was right
>
> Further investigation is showing that my Compex WPJ563 (Qualcomm
> Atheros QCA9563 74Kc MIPS processor, Dragonfly Series 64KB I-Cache and
> 32 KB D-Cache, targeted to operate at 775MHz 128MB System Memory, 16MB
> NOR Flash) is the bottleneck.
>
> I've tested on the 1Gbps Ethernet link between a laptop with a 1Gbps
> port and the Compex 1Gbps port and the best throughput I got was 98
> Mbps. This was with 3 TCP streams on iperf.
>
> I'm still finding it hard to believe that I can't get more speed out
> of this compex board running openwrt ... top is not showing the CPU go
> over 30% with iperf when the test is running
>
> Thanks for the other advice - I've built a test rig with antennas
> oriented like a propeller at 120 degrees (I'll share a pic) ... once
> I sort out the underlying problem or upgrade my router board - I'll
> test this mimo rig.
>
> David
>
> On Fri, Oct 5, 2018 at 6:02 PM Ben Greear <greearb at candelatech.com> wrote:
> >
> > If you are running iperf on a weak-ish AP CPU, then that will be a bottleneck.
> > Run iperf on external system through the AP instead. For TCP, use multiple streams,
> > and first test with Ethernet mode to make sure iperf and/or CPU is not the bottleneck
> > before you move to testing the WiFi interfaces.
> >
> > We can get around 900Mbps UDP download throughput on a 'perfect' setup with 3x3 9880 WLE900VX
> > systems and the ath10k-ct firmware.
> >
> > Forcing MCS rate is not a good idea...tune antennas and/or RF environment so that you do not have
> > to force MCS to get highest encoding rate.
> >
> > Thanks,
> > Ben
> >
> > On 10/05/2018 04:17 AM, David Johnson wrote:
> > > I'm trying to see what max speed can be achieved
> > >
> > > My setup is as follow:
> > > Board: Compex WPJ 563
> > > Card Compex wle900vx
> > > OS: Libremesh running openwrt 18.06
> > > Driver: ath10k_pci 0000:00:00.0: firmware ver 10.2.4-1.0-00033 api 5
> > > features no-p2p,raw-mode,mfp,allows-mesh-bcast crc32 c41417d0
> > > Firmware: firmware-5.bin_10.2.4-1.0-00041
> > >
> > > Physical setup
> > > Connected 3 6dBi antennas on each side to CH0, CH1, CH2 port to
> > > achieve 3x3 mimo. Distance between 2 devices is 2m on a bench. Set
> > > power level on each end to 8 dBm to ensure I don't saturate radios
> > >
> > > Status of radio Node A
> > > iwinfo wlan0-mesh info
> > > wlan0-mesh ESSID: "speedtest"
> > > Access Point: 04:F0:21:3E:DA:A2
> > > Mode: Client Channel: 48 (5.240 GHz)
> > > Tx-Power: 8 dBm Link Quality: 70/70
> > > Signal: -33 dBm Noise: -102 dBm
> > > Bit Rate: 6.0 MBit/s
> > > Encryption: none
> > > Type: nl80211 HW Mode(s): 802.11bgnac
> > > Hardware: 168C:003C 0000:0000 [Qualcomm Atheros QCA9880]
> > > TX power offset: none
> > > Frequency offset: none
> > > Supports VAPs: yes PHY name: phy0
> > >
> > > Status of radio Node B
> > > wlan0-mesh ESSID: "speedtest"
> > > Access Point: 04:F0:21:3E:DA:A2
> > > Mode: Master Channel: 48 (5.240 GHz)
> > > Tx-Power: 8 dBm Link Quality: 65/70
> > > Signal: -45 dBm Noise: -105 dBm
> > > Bit Rate: 6.0 MBit/s
> > > Encryption: none
> > > Type: nl80211 HW Mode(s): 802.11bgnac
> > > Hardware: 168C:003C 0000:0000 [Qualcomm Atheros QCA9880]
> > > TX power offset: none
> > > Frequency offset: none
> > > Supports VAPs: yes PHY name: phy0
> > >
> > >
> > > Ping between radios
> > >
> > > root at FlatsEast:~# ping 10.69.0.1
> > > PING 10.69.0.1 (10.69.0.1) 56(84) bytes of data.
> > > 64 bytes from 10.69.0.1: icmp_req=1 ttl=64 time=1.29 ms
> > > 64 bytes from 10.69.0.1: icmp_req=2 ttl=64 time=1.22 ms
> > > 64 bytes from 10.69.0.1: icmp_req=3 ttl=64 time=1.22 ms
> > >
> > > Used iperf to set throughput
> > > Client side
> > > iperf -c 10.69.0.1 -P 10 -i 5 -t 120
> > >
> > > Server side
> > > iperf -s
> > >
> > > Best performance achieved after waiting for TCP to stabalize: 139 Mbps
> > > [ 12] 45.0-50.0 sec 11.8 MBytes 19.7 Mbits/sec
> > > [ 11] 45.0-50.0 sec 7.12 MBytes 12.0 Mbits/sec
> > > [ 9] 45.0-50.0 sec 8.12 MBytes 13.6 Mbits/sec
> > > [ 6] 45.0-50.0 sec 7.75 MBytes 13.0 Mbits/sec
> > > [ 8] 45.0-50.0 sec 8.00 MBytes 13.4 Mbits/sec
> > > [ 4] 45.0-50.0 sec 7.75 MBytes 13.0 Mbits/sec
> > > [ 3] 45.0-50.0 sec 7.75 MBytes 13.0 Mbits/sec
> > > [ 10] 45.0-50.0 sec 6.62 MBytes 11.1 Mbits/sec
> > > [ 7] 45.0-50.0 sec 7.88 MBytes 13.2 Mbits/sec
> > > [ 5] 45.0-50.0 sec 9.88 MBytes 16.6 Mbits/sec
> > > [SUM] 45.0-50.0 sec 82.6 MBytes 139 Mbits/sec
> > >
> > > top:
> > >
> > > Mem: 47064K used, 78232K free, 188K shrd, 3936K buff, 10564K cached
> > > CPU: 19% usr 36% sys 0% nic 0% idle 0% io 0% irq 43% sirq
> > > Load average: 4.59 3.06 1.90 3/74 25823
> > > PID PPID USER STAT VSZ %VSZ %CPU COMMAND
> > > 3 2 root RW 0 0% 32% [ksoftirqd/0]
> > > 24511 4419 root S 33320 27% 22% iperf -c 10.69.0.1 -P 10 -i 5 -t 120
> > >
> > > Any suggestions
> > >
> > > Regards
> > > David
> > >
> >
> > --
> > Ben Greear <greearb at candelatech.com>
> > Candela Technologies Inc http://www.candelatech.com
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