Re: CVS commit: src/sys/dev/usb

[Michael van Elst <mlelstv%serpens.de@localhost>]

On Thu, Jan 24, 2019 at 03:51:02PM +0100, Robert Swindells wrote:
> "Michael van Elst" <mlelstv%netbsd.org@localhost> wrote:
> > Module Name:    src
> > Committed By:   mlelstv
> > Date:           Sat Jan  5 07:56:07 UTC 2019
> > 
> > Modified Files:
> >        src/sys/dev/usb: if_mue.c if_muevar.h
> > 
> > Log Message:
> > Enable multiple outstanding transfers.
> > 
> > iperf3 now shows 250MBit/s for sending and 225MBit/s for receiving.
> 
> Which device was this tested on ?
> 
> It doesn't work at all for me on a LAN7500.

Tested on an RPI3b+ which is LAN7800.

But I now see some inconsistent performance for receiving.

Example: client is netbsd-8/i386 re0, server is RPI3b+

% iperf3 -c jowlson 

[  6] local 10.28.5.2 port 54509 connected to 10.28.5.23 port 5201
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  6]   0.00-1.00   sec  12.8 MBytes   107 Mbits/sec    0   55.1 KBytes       
[  6]   1.00-2.00   sec  23.7 MBytes   199 Mbits/sec    0   28.3 KBytes       
[  6]   2.00-3.00   sec  25.7 MBytes   216 Mbits/sec    0   41.0 KBytes       
[  6]   3.00-4.00   sec  25.6 MBytes   215 Mbits/sec    0   28.3 KBytes       
[  6]   4.00-5.00   sec  25.7 MBytes   215 Mbits/sec    0   52.3 KBytes       
[  6]   5.00-6.00   sec  25.6 MBytes   214 Mbits/sec    0   46.7 KBytes       
[  6]   6.00-7.00   sec  25.6 MBytes   215 Mbits/sec    0   53.7 KBytes       
[  6]   7.00-8.00   sec  25.7 MBytes   215 Mbits/sec    0   31.1 KBytes       
[  6]   8.00-9.00   sec  25.6 MBytes   215 Mbits/sec    0   31.1 KBytes       
[  6]   9.00-10.00  sec  25.7 MBytes   215 Mbits/sec    0   38.2 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  6]   0.00-10.00  sec   242 MBytes   203 Mbits/sec    0             sender
[  6]   0.00-10.00  sec   241 MBytes   202 Mbits/sec                  receiver

Example2: client is netbsd-7/amd64 wm0

Connecting to host jowlson, port 5201
[  6] local 10.28.5.19 port 64879 connected to 10.28.5.23 port 5201
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  6]   0.00-1.00   sec  14.3 MBytes   120 Mbits/sec    0   2.83 KBytes       
[  6]   1.00-2.01   sec  12.1 MBytes  99.9 Mbits/sec    0   2.83 KBytes       
[  6]   2.01-3.00   sec  4.82 MBytes  41.0 Mbits/sec    1   41.0 KBytes       
[  6]   3.00-4.00   sec  17.5 MBytes   147 Mbits/sec    0   29.7 KBytes       
[  6]   4.00-5.00   sec  2.23 MBytes  18.6 Mbits/sec    0   2.83 KBytes       
[  6]   5.00-6.01   sec  8.12 MBytes  68.0 Mbits/sec    1   2.83 KBytes       
[  6]   6.01-7.00   sec  2.89 MBytes  24.4 Mbits/sec    1   24.0 KBytes       
[  6]   7.00-8.01   sec  6.67 MBytes  55.5 Mbits/sec    0   1.41 KBytes       
[  6]   8.01-9.00   sec  7.06 MBytes  59.7 Mbits/sec    4   4.24 KBytes       
[  6]   9.00-10.01  sec  6.43 MBytes  53.4 Mbits/sec    0   2.83 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  6]   0.00-10.01  sec  82.1 MBytes  68.8 Mbits/sec    7             sender
[  6]   0.00-10.01  sec  82.0 MBytes  68.7 Mbits/sec                  receiver

notice the Retr column, somewhere packets get lost.

The reverse direction (-R) is fine in both setups.


Greetings,
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."