[Udpcast] Udpcast Digest, Vol 123, Issue 1

Brent Kimberley Brent.Kimberley at durham.ca
Wed Feb 24 18:28:16 CET 2016


Hi Richard,
Your performance on a general purpose machine should exceed the following.

        384mbps @9000
        395mbps @4096
        352mbps @1456
        312mbps @1024
        193mbps @256
         63mbps  @64

Best Regards,
Brent

<snippet>
@REM cd %TEMP%
@REM fsutil file createnew test1.tx 2199023255552
@REM dir test1.tx

@REM cd %TEMP%
.\udp-sender.exe -b <blocksize> --autostart 5 --stat-period 2000 --max-bitrate 1000m --async --fec 8x8 --mcast-rdv-addr 127.0.0.1 --mcast-data-addr 127.0.0.1 --interface 127.0.0.1 --file test1.tx

@REM cd %TEMP%
.\udp-receiver.exe --file test.<blocksize>.rx  --nosync --mcast-rdv-addr 127.0.0.1 --stat-period 2000 --interface 127.0.0.1

@REM del test*.* udp*.exe
</snippet>

< receiver observations>
UDP receiver for test.64.rx at 127.0.0.1 on Software Loopback Interface 1
Connected as #0 to 127.0.0.1
bytes=  2 097 152K ( 63.23 Mbps))
Transfer complete.

UDP receiver for test.256.rx at 127.0.0.1 on Software Loopback Interface 1
Connected as #0 to 127.0.0.1
bytes=  2 097 152K (193.83 Mbps))
Transfer complete.

UDP receiver for test.1024.rx at 127.0.0.1 on Software Loopback Interface 1
Connected as #0 to 127.0.0.1
bytes=  2 097 152K (312.40 Mbps)
Transfer complete.

UDP receiver for test.4096.rx at 127.0.0.1 on Software Loopback Interface 1
Connected as #0 to 127.0.0.1
bytes=  2 097 152K (395.57 Mbps))
Transfer complete.

UDP receiver for test.9000.rx at 127.0.0.1 on Software Loopback Interface 1
Connected as #0 to 127.0.0.1
bytes=  2 097 152K (384.52 Mbps)
Transfer complete.

UDP receiver for test.1456.rx at 127.0.0.1 on Software Loopback Interface 1
Connected as #0 to 127.0.0.1
bytes=  2 097 152K (352.54 Mbps)
Transfer complete.
</receiver observations>

Message: 1
Date: Thu, 18 Feb 2016 18:39:30 +0000
From: "Evans, Richard K. (GRC-H000)" <richard.k.evans at nasa.gov>
To: "udpcast at udpcast.linux.lu" <udpcast at udpcast.linux.lu>
Cc: "Evans, Richard K. \(GRC-H000\)" <richard.k.evans at nasa.gov>
Subject: [Udpcast] maximum asynchronous speed and Jumbo Frames
Message-ID:
        <DC3FB55EE7FEFD409A6FC1EA00D50D0B0F5C4510 at NDJSMBX203.ndc.nasa.gov>
Content-Type: text/plain; charset="iso-8859-1"

Hello, I am using the UDPCast in asynchronous mode to transmit large data files through a Data Security Diode (mono-directional network).

Here is the command we use to transmit:

Udp-sender.exe --async --fec 8x8 --max-bitrate 1000m --mcast-rdv-addr 224.2.2.1 --mcast-data-addr 224.2.2.2 --interface <ipTx> --file myfile.dat

The Receive command I use is:

udp-receiver.exe --nosync --mcast-rdv-addr 224.2.2.1 --interface <ipRx> --f myfile.dat

Overall, this works well but we have noticed that we can't get the network transmission speed up above 2-3 % (22Mbps) of the Gigabit Ethernet adapter's full capability (1000Mbps). We also know that we are not processor limited, nor are we disk speed limited or anything else we can think of.

I know that the asynchronous mode application is for satellite transmissions that are understandably slower than what a file transfer purely over Gibabit Ethernet can do, so I am writing here to ask if any one has any thoughts or insights about what might be the core issue that keeps the process running so slow.

Fwiw, the Data Security Diode is a Canary GT-10SD, but for tuning UDPCast, we bypass the diode with a direct cable connection between Tx and Rx machines. So the performance of the system I am describing is without the diode in place.

Thanks in advance, folks.
-Rich

- Richard Evans, NASA GRC - Plum Brook Station ? http://www.linkedin.com/in/rkevans
???216.973.4398




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