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UDP data rate slow with 1GBE ethernet connection

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hi folks,
i have a two work station that are connects via 1GBE ethernet.
when transfering data at this setup i've encountered that the data rate is ~20MBs which is mach lower then the expected data rate of a 1GBe comminication. i've used udp object and udpport object that ended up with the same results in MATLAB. Code below>>
ferther investing this ive found out that an off the shelf Cpp code gets 800MBs data rate.
  • is there a way to enhance or controll the data rate from within MATLAB?
  • if not how can i work with higher data rates inder my setup, use external C\Java code?
--------------------------------------- Code ---------------------------------------
% TASK send data from port A to Port B
% UDP test for the same computer nIP = 1
% UDP test for the two computers nIP = 2
clc, clear all, close all
n_packets = 200;
packet_size = 4096;
BufferSize = packet_size * 2;
nIP = 1;
%
ipA = '192.168.1.100'; portA = 9092;
if nIP == 1
ipB = '192.168.1.100'; portB = 9093;
else
ipB = '192.168.1.101'; portB = 9093;
end
u=udp(ipB,'RemotePort',portB,'Localport',portA);
set(u, 'InputBufferSize', BufferSize);
set(u, 'OutputBufferSize', BufferSize);
set(u,'DatagramTerminateMode','off')
set(u,'Timeout',0.01);
a = zeros(packet_size,1,'int16');
b = zeros(packet_size,1,'int16');
a = ones(packet_size,1,'int16');
i = 1;
miss_count = 0;
fopen(u);
tic
% Loop over write
while 1 %i<n_packets
a(1) = mod(i,32767);
fwrite(u,a,'int16');
i = i + 1;
end
t_proc = toc;
echoudp('off');
fclose(u);
delete(u);
data_rate = ((n_packets * packet_size * 16)/1e6)/t_proc;
fprintf('\n n_miss_packet = %g',miss_count);
fprintf('\n tudp_trx_sec = %g',t_proc);
fprintf('\n udp_rate_Mbit/s = %g',data_rate);
% TASK get data from port A to Port B
% TASK send data from port A to Port B
% UDP test for the same computer nIP = 1
% UDP test for the two computers nIP = 2
clc, clear, close all
n_packets = 200;
packet_size = 4096; % 16 bits
BufferSize = packet_size * 2;
nIP = 1;
%Shimmi
ii_max = 15;
t_proc_sum = zeros(size(1:ii_max));
miss_count_sum = zeros(size(1:ii_max));
date_rate_sum = zeros(size(1:ii_max));
ipA = '10.1.21.81'; portA = 9092;
if nIP == 1
ipB = '192.168.1.100'; portB = 9093;
else
ipB = '192.168.1.100'; portB = 9093;
end
for ii=1:ii_max
u=udp(ipA,'RemotePort',portA,'Localport',portB);
set(u, 'InputBufferSize', BufferSize);
set(u, 'OutputBufferSize', BufferSize);
a = zeros(packet_size,1,'int16');
b = zeros(packet_size,1,'int16');
a = ones(packet_size,1,'int16');
set(u,'DatagramTerminateMode','off')
set(u,'Timeout',0.01);
i = 1;
iprev = 1;
miss_count = 0;
% Open UDP
fopen(u);
tic
% Loop over read
while i<n_packets
b=fread(u,packet_size,'int16');
icurr = b(1);
if (iprev ~= icurr)
miss_count = miss_count + 1;
end
iprev = icurr + 1;
i = i + 1;
end
t_proc = toc;
echoudp('off');
fclose(u);
delete(u);
data_rate = ((n_packets * packet_size * 16)/t_proc)/1e6;
%
% fprintf('\n n_miss_packet = %g',miss_count);
% fprintf('\n tudp_rx_sec = %g',t_proc);
% fprintf('\n udp_rate_Mbit/s = %g',data_rate);
%analytics
miss_count_sum(ii) = miss_count;
t_proc_sum (ii) =t_proc;
date_rate_sum (ii) = data_rate;
ii = ii+1;
end
fprintf('\n n_miss_packet = %f',mean(miss_count_sum));
fprintf('\n tudp_rx_sec = %f',mean(t_proc_sum));
fprintf('\n udp_rate_Mbit/s = %f',mean(date_rate_sum));
fprintf('\n ');

Answers (1)

Vinayak
Vinayak on 17 Jan 2024
Hi Shimon,
The issues with UDP performance that you've outlined could stem from various factors. To address this, I recommend the following actions:
  • Confirm that the network infrastructure can accommodate the required transfer speeds.
  • Optimize the Buffer Size and Packet Sizes; experimenting with different combinations of values can help find the optimal balance, minimizing overhead and fragmentation.
  • Explore the potential of parallel processing capabilities, if applicable to your specific problem.
  • Consider utilizing external language interfaces such as C or Python.
For further information on udpport”, and the Parallel Computing Toolbox, please refer to the following links:
Hope this helps!

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