[Linrad] R: [Linrad] Re: Linrad053 and Ubuntu

["libero.it; ik7ezn@xxxxxxxxxxxxxxxx>]

Hi All.

With the change recommended by Leif the problem seems solved.
 You 
can configure Alsa native or oss without  errors  ( Ubuntu 8.10 with gcc 
4.3.2).


73 Ermanno / ik7ezn


>----Messaggio originale----
>Da: leif@xxxxxxx
com
>Data: 14/11/2008 23.00
>A: "ik7ezn@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>, 
"linrad@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
>Ogg: [Linrad] Re: Linrad053 
and Ubuntu
>
>
>Hi All,
>
>Ermanno reported a bug when running Linrad02-53 with 
native
>ALSA under Ubuntu.
>
>The error is a buffer overflow, line 93 in lsetad.
c:
>char alsa_dev_plughw_pcm_name [10];
>does not allocate enough space. Change 
it to:
>char alsa_dev_plughw_pcm_name [16];
>
>It is interesting (=frustrating) 
that this error is not
>reported when I run with valgrind under e.g. Debian.
>

>Maybe the memory allocation is aligned to actually reserve
>a couple of more 
bytes and that the formal error therefore
>does not cause any problem. Under 
Ubuntu, at run time, there
>seems to be some error checking because xlinrad 
exits with:
>*** buffer overflow detected ***: ./xlinrad terminated
>followed 
by a traceback that points to an address within Linrad
>(that I have no idea 
how to use) plus a (useless to me) 
>memory map.
>
>Linrad now runs well as a 
transceiver under Debian and svgalib.
>The X11 server causes some extra 
latency, I have not yet added
>a "tx output delay margin" that could be set to 
accomodate 
>the latency times of the X11 server.
>This can be done - but there 
will be a small penalty when running 
>under X11 in a longer time delay between 
the key is pushed and RF 
>appears at the antenna. 
>
>I have not been 
sucessful in installing svgalib under Ubuntu.
>Another thing is that X11 uses 
far more cpu time under Ubuntu 
>compared to Debian. I do not think the memory 
checking that seems to
>be included in Linrad when compiled under Ubuntu is 
responsible 
>because the xlinrad executable compiled under Debian runs at 28% 
cpu
>load exactly as the ./xlinrad compiled under Ubuntu. When I run 
>the same 
executable under Debian X11 on the same computer with 
>the same parameters, 
the cpu load is 17% only (with svgalib 15%.)
>
>When running the system monitor 
together with Linrad using the same
>computer and linrad parameters, the cpu 
load as shown by the system
>monitor is 90% with Ubuntu while it is 30% with 
Debian.
>
>Maybe ALSA is compiled with memory error checking under Ubuntu?
>
(And other X11 parts as well?)
>
>The system monitor adds a large latency time 
so output delay margin 
>has to be set high. It is also necessary to set a low 
"max DMA rate"
>to make soundcard buffers large when running the system 
monitor.
>There is not yet any Tx output delay margin so the Tx side does 
>not 
work if the system monitor is allowed to run.
>
>                          
---   ooo   ---
>
>Before I upload Linrad-02.54 with the 
alsa_dev_plughw_pcm_name 
>correction I would like to know if there is anything 
else that 
>does not seem right with 02-53.
>
>73
>
>Leif
>
>
>
>
>
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