[linux-dvb] Re: packet loss DVB-ip

[Alexandre CONRAD <aconrad.tlv@magic.fr>]

Hi,

Here's what i'm experimenting truly :

START (2 file(s), 8.83 MB)...
File 1/2: <test.mpg> downloading (6572 packets)...
File 2/2: <fill.txt> downloading (1 packets)...
NOT COMPLETE, wait for repairing...

then I cat the "info" file to show me witch packets were lost :
0|615*0|685*0|1147*0|1192*0|1300*0|1345*0|1459*0|1545*0|1570*0|1700*0|1725*0|1810*0|1880*0|2010*0|2035*0|2167*0|2192*0|2318*0|2343*0|2477*0|2697*0|2806*0|3005*0|3201*0|3271*0|3709*0|3779*0|3821*0|3891*0|4243*0|4288*0|4352*0|4397*0|5134*0|5179*0|5707*0|5906*0|5976*0|6104*0|6174*0|6217*0|6287*0|6415*0|6485* 

44 packets lost.
0,669% lost.

Again with an other file :

START (2 file(s), 11.6 MB)...
File 1/2: <test2.mpg> downloading (8672 packets)...
File 2/2: <fill.txt> downloading (1 packets)...
NOT COMPLETE, wait for repairing...

cat info file :
1|151*1|196*1|238*1|263*1|305*1|612*1|657*1|927*1|962*1|1004*1|1049*1|1559*1|1594*1|1714*1|1759*1|1801*1|1826*1|1913*1|1983*1|2025*1|2070*1|2427*1|2452*1|2497*1|2606*1|3448*1|3473*1|3551*1|3839*1|3864*1|4220*1|4265*1|4531*1|4576*1|4617*1|4642*1|4841*1|4886*1|5103*1|5193*1|5458*1|6010*1|6035*1|6122*1|6192*1|6234*1|6279*1|6854*1|6899*1|7341*1|7366*1|7408*1|7453*1|7808*1|7833*1|7957*1|7992*1|8034*1|8069*1|8110*1|8190*1|8509*1|8534* 

63 packets lost.
0,726% lost.

So as you can see, I'm loosing regularty packets during the whole 
transmission...

The other computer with a pentamedia card doesn't have any problem, it 
get's all packets. So I know my provider is not screwed up.

Any ideas ? From where could this come from ?

ifconfig dvb0_0 inet 1.2.3.4 promisc hw ether 01:02:03:04:05:06
route add -net 224.0.0.0 netmask 224.0.0.0 dev dvb0_0

dvb0_0    Link encap:Ethernet  HWaddr 01:02:03:04:05:06
        inet addr:1.2.3.4  Bcast:1.255.255.255  Mask:255.0.0.0
        UP BROADCAST RUNNING NOARP PROMISC MULTICAST  MTU:4096  Metric:1
        RX packets:1008514 errors:0 dropped:0 overruns:0 frame:0
        TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:100
        RX bytes:1387850777 (1323.5 Mb)  TX bytes:0 (0.0 b)
        Base address:0x962


route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use 
Iface
10.210.201.0    *               255.255.255.0   U     0      0        0 
eth0
1.0.0.0         *               255.0.0.0       U     0      0        0 
dvb0_0
127.0.0.0       *               255.0.0.0       U     0      0        0 lo
224.0.0.0       *               224.0.0.0       U     0      0        0 
dvb0_0
default         10.210.201.11   0.0.0.0         UG    0      0        0 
eth0


Regards,
--
Alexandre CONRAD
Research & Development
tel : +33 1 30 80 55 00
fax : +33 1 30 56 50 20
TLV
6, rue de la plaine
78860 - SAINT NOM LA BRETECHE
FRANCE



> I'm got my DVB-IP working (finally). I'm getting packets. But when I 
> download a file with Eutelsat's open-sky client, the 1st test hung my 
> computer after a 100kB downloaded. (maybe it was only my SSH session, 
> I didn't think going to the other room, trying to type on the keyboard 
> if the PC was still alive).
>
> Then I tryied again, with increasing `echo "1048576" > 
> /proc/sys/net/ipv4/route/max_size`. This went all the way through, but 
> I get packet loss... out of 6500 packet, I get around 50 packet lost 
> with a FEC of 5% when sending data.
> At the same time, an other PC is downloading with a pentamedia card, 
> and it receives all packets without any problem.
>
> Has anyone experienced that ?
>
> Regards,



--
Alexandre CONRAD
Research & Development
tel : +33 1 30 80 55 00
fax : +33 1 30 56 50 20
TLV
6, rue de la plaine
78860 - SAINT NOM LA BRETECHE
FRANCE




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