[linrad] Re: MAP65 and Linrad Network

[Leif Asbrink <sm5bsz.com; leif@xxxxxxxxxxxxxxxx>]

Hi Joe,

> OK, I tried it with both programs running on the same 
> (Linux) computer.  In this case the two programs were "plrs" 
> (my "pseudo-Linrad send" program) and MAP65.  The Linux 
> computer has two Xeon CPUs at 2.4 GHz, each with 512 kB L2 
> cache, and 1 GB memory.
> 
> The combination works OK, and but a significant number of 
> packets (around 400 in each minute, or slightly more than 1% 
> of the data) are dropped during MAP65's most 
> compute-intensive parts of each minute.  Since plrs does no 
> significant computing, I imagine that the problem may be 
> worse when running Linrad + MAP65.
It could also be the other way around.....

> Of course it should be possible to improve this situation; I 
> have not yet tried to address it.  In the meantime, I shall 
> continue to test with Linrad (or plrs) running on one 
> computer, MAP65 on another.
OK. It may be necessary to add a call to Sleep(0) under Windows
or to sched_yield() under Linux at regular intervals in all
routines that might lock up the CPU for a too long time.

Those calls are effected by lir_sched_yield() in the OS independent
code of Linrad and I found it necessary to place about 45 such
calls within Linrad.

73

Leif / SM5BSZ

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