Re: [Make-wifi-fast] Flent test hardware

[Bob McMahon <bob.mcmahon@broadcom.com>]

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Just to be clear, speaking for iperf 2, the binding isn't to an interface
but to an IP address.   See this for a description
<https://sourceforge.net/p/iperf2/discussion/general/thread/f856ae2c/>.

Linux supports SO_BINDTODEVICE but it's not straightforward per things like
ARP so I didn't add support for this.

Bob

On Mon, Nov 6, 2017 at 12:15 PM, Isaac Konikoff <isaac.konikoff@gmail.com>
wrote:

> You can run flent/iperf/netperf client and server on the same box using a
> candelatech kernel and then bind to specific interfaces.
>
> http://candelatech.com/private/downloads/r5.3.6/ct4.9.29+.x64.tar.gz
> guest/guest
>
> flent example:
> eth1 192.168.1.2 to DUT(AP LAN side)
> wlan0 192.168.1.3 to DUT(AP wireless)
>
> netserver
> flent -H 192.168.1.3 --local-bind 192.168.1.2 --swap-up-down -x
> tcp_download -l 120
>
>
> iperf example:
> eth1 192.168.86.103
> wlan0 192.168.86.101
>
> iperf upload test
> iperf -s -B 192.168.86.103 -i10
> iperf -c 192.168.86.103 -B 192.168.86.101 -i10 -t120
>
> iperf download test
> iperf -s -B 192.168.86.101 -i10
> iperf -c 192.168.86.101 -B 192.168.86.103 -i10 -t120
>
>
> On Sun, Nov 5, 2017 at 5:57 AM, Pete Heist <peteheist@gmail.com> wrote:
>
>>
>> On Nov 5, 2017, at 2:42 AM, Bob McMahon <bob.mcmahon@broadcom.com> wrote:
>>
>> I have some brix with realtek and run ptpd installed with fedora 25.
>> The corrections are in the 25 microsecond range, though there are
>> anomalies.  These are used for wifi DUTs that go into RF enclosures.
>>
>> [root@hera ~]# tail -n 1 /var/log/ptpd2.stats
>> 2017-11-04 18:33:46.723476, slv, 0cc47afffea87386(unknown)/1,
>> 0.000000000, -0.000018381,  0.000000000, -0.000018463, 1528.032750001,
>> S, 0.000000000, 0, -0.000018988, 1403, 1576, 17, -0.000018463,  0.000000000
>>
>> For LAN/WAN traffic, I tend to use the intel quad server adapters in a
>> supermicro mb desktop with 8 or more real cores.  (I think the data center
>> class machines are worth it.)
>>
>>
>> Thanks for the info. I was wondering how large the PTP error would be
>> with software timestamps, and I see it’s not bad for most purposes.
>>
>> Which Realtek Linux driver does your brix use, and is it stable? The
>> r8169 driver’s BQL support was reverted at some point and it doesn’t look
>> like that has changed.
>>
>> I trust that the extra cores can help, particularly for tests with high
>> flow counts, but my project budget won’t allow it, and used hardware is too
>> much to think about at the moment.
>>
>> Do you (or anyone) know of any problems with running the Flent client and
>> server on the same box? In the case of the Proliant Microserver, the
>> Broadcom 5720 adapter should have separate PCI data paths for each NIC. I
>> guess the bottleneck will still mainly be the CPU. To get some idea of
>> what's possible on my current hardware, I tried running rrul_be_nflows
>> tests with the Flent client and server on the same box, through its local
>> adapter (with MTU set to 1500) with my current Mac Mini (2.26 GHz Core2 Duo
>> P7550). I know that doesn’t predict how it will work over Ethernet, but
>> it’s a start.
>>
>> https://docs.google.com/spreadsheets/d/1MVxGsreiGKNXhfkMIheN
>> FrH_GVllFfiH9RU5ws5l_aY/edit#gid=1583696271
>>
>> Although total throughput is pretty good for a low-end CPU, I’m not sure
>> I’d trust the results above 64/64 flows. 256/256 flows was an epic fail,
>> but I won’t be doing that kind of test.
>>
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>>
>
>

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