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Old 05-27-2004, 03:11 PM   #1
LQ Newbie
Registered: May 2004
Posts: 23

Rep: Reputation: 15
Question NETPERF: error --> send_udp_stream: error on remote: Interrupt

Hi all,

I am trying to run "netperf" and it works perfectly well with tcp but I can get it to work with udp.
The following is what I am doing:

[root@localhost netperf]# ./netperf -H -t TCP_STREAM -- -m 1000
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec

87380 16384 1000 10.00 93.84

The above works just fine. Now is the problem.

[root@localhost netperf]# ./netperf -H -t UDP_STREAM -- -m 1000
send_udp_stream: error on remote: Interrupted system call

I have modified the following files:
in /etc/services :
added --> netperf 12865/tcp
netperf 12865/udp

in /etc/xinetd.d created a file named "netperf". This file contains the following:

service netperf
disable = no
socket_type = stream
protocol = tcp
wait = no
user = root
server = /home/dravya/netperf/netserver
server_args =

Greatly appreciated if I can get help with the the above problem .
I need to do this test URGENTLY
thank you

Old 06-04-2004, 05:50 PM   #2
LQ Newbie
Registered: Jun 2004
Posts: 1

Rep: Reputation: 0
I''m not sure WHY this is happening, but I think it has to do with the signal sent to stop the UDP stream test.
When netperf does a UDP stream test it uses a timer to set the duration of the test.
Both the server and client start the timer, and then the client starts sending data to the server.
When the timer is up the server does one more call to recv() and gets back -1 (SOCKET_ERROR) and puts errno 4 (#define EINTR 4 /* Interrupted system call */)
This is sent back to the client which reports the error and exits.

A not-so-elegant workaround for this is to comment out the check for SOCKET_ERROR, or better yet check errno for value of 4 and ignore only that SOCKET_ERROR....

To ignore all SOCKET_ERRORs comment the if statement in nettest_bsd.c around line 5236......

/* <--added this
if ((len == SOCKET_ERROR) && SOCKET_EINTR(len)) {
netperf_response.content.serv_errno = errno;
and this --> */

recompile and it will run the udp tests now.

I found this code at line 5236 in nettest_bsd.c from version 2.2pl5 of netperf, its near the end of the "recv_udp_stream" function, inside the main while loop, while (!times_up)
Old 06-07-2004, 09:40 AM   #3
LQ Newbie
Registered: May 2004
Posts: 23

Original Poster
Rep: Reputation: 15
Netperf client only waits now....

Hi wkoontz,

Thank you very much for your response. It did solve the problem of the error message. However now when I type in "./udp_stream_trest" I only get the following with a blinking cursor:

Testing with the following command line:
/home/dravya/netperf/netperf -l 5 -H -i 10,2 -I 99,10 -v 5 -t UDP_STREAM -- -m 64
UDP UNIDIRECTIONAL SEND TEST to : +/-5.0% @ 99% conf.
(blinking cursor here)

Once I hit CTRL+C, I get the following:

!!! Desired confidence was not achieved within the specified iterations.
!!! This implies that there was variability in the test environment that
!!! must be investigated before going further.
!!! Confidence intervals: Throughput : 51.0%
!!! Local CPU util : 0.0%
!!! Remote CPU util : 0.0%

I don't get any numbers. Where can I go from here???

Thank you very much again.... any suggestions would be greatly appreciated.


Old 07-29-2004, 02:04 PM   #4
LQ Newbie
Registered: May 2004
Posts: 7

Rep: Reputation: 0
I'm getting the same thing. TCP works fine but UDP gives the above error.


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