[Udpcast] Experiencing reproducible corruption when using udpcast-20090912

John Eisenman jice at wink.com
Wed Sep 16 06:58:32 CEST 2009


John Eisenman wrote:
> I'm new to udpcast and so may be doing something wrong.  However, I find
> that with the latest two versions (udpcast-20090912 or
> udpcast-20090830), I experience repeated file corruption.  I've had
> better, but not perfect,  success with an old version (udpcast-20071228).
>
> In order to test, I made an ordered file, 500MB in size:
>
> cl6 tmp # ls -l test-52428800.dat
> -rw-r--r-- 1 jice jice 524288000 Sep 15 17:52 test-52428800.dat
> cl6 tmp # head -14 test-52428800.dat
> 000000000
> 000000001
> 000000002
> 000000003
> 000000004
> 000000005
> 000000006
> 000000007
> 000000008
> 000000009
> 000000010
> 000000011
> 000000012
> 000000013
>
> I find that every time I send and receive a file, it is the correct
> length.  However, certain data is missing and other data is repeated.  
>
> Here is an example of my command line to send the data:
>
> udp-sender --log udpcast.log --bw-period 1 --nokbd --min-receivers 1
> --min-wait 5 --portbase 9010 -f test-52428800.dat --pointopoint
>
> Here is my command line to receive data:
>
> udp-receiver  -f test2 --nokbd --portbase 9010
>
> I have test result files that I can provide if they would be helpful.
>
> I am running under Gentoo on AMD64 processors.  I've tried under two
> different kernels:
>
> # uname -a
> Linux cl7 2.6.20-gentoo-r8 #1 SMP PREEMPT Wed Aug 22 14:28:25 PDT 2007
> x86_64 AMD Opteron(tm) Processor 246 AuthenticAMD GNU/Linux
>
> # uname -a
> Linux m231 2.6.30-gentoo-r4pb #2 SMP Thu Aug 27 18:41:51 PDT 2009 x86_64
> Quad-Core AMD Opteron(tm) Processor 2374 HE AuthenticAMD GNU/Linux
>
>
>
>   
Additional information:

By running in async mode (and setting an fec), I find that I am able to 
produce a non-corrupt output file.  Perhaps this provides a clue as to 
the source of the problem.








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