[streaming] Streaming problems through a 100M interface
Shmuel Vagner
Shmuel.Vagner at celeno.com
Sun Aug 16 17:53:56 CEST 2009
HI All,
I have the following strange problem when I try to stream a video file between 2 laptops:
The Setup:
Streaming laptop: LenovoX60 with windows XP SP3 running VLC 0.8.6c.
Receiving laptop: HP Compaq nc6320 with windows XP SP3 running VLC 0.8.6c.
Firelwalls on both LPTs are off.
The laptops are connected through a 10M/100M Ethernet switch.
When I start streaming a single 15M unicast stream, it streams for about 1 second and then stops.
Now I will describe several scenarios where the streaming works fine between these 2 laptos:
1 - When I reverse the roles of the laptops then the streaming works.
2 - When I connect the laptops directly using a cross cable then the streaming works. (Both laptops have a 1GB Ethernet NICs).
3 - Using the same connection settings (Lenovo à Ethernet Switch à HP) I run IPERF with 1370B packets (The same packet sizes that VLC generates) and I get 95Mbps throughput without problems.
So.. .
A - It cannot be a problem with the switch - Ruled out by scenarios 1 and 3
B - It cannot be a problem with the NICs - Ruled out by all scenarios.
C - It cannot be because of weak laptops - ruled out by scenario 2.
Another interesting observation is that when I check the network utilization on the transmitter LPT (Lenovo), it never goes above 8% (which is 8Mbps in a fast Ethernet network) when streaming through the VLC, while it gets up to 95% when stream using IPERF.
I am out of ideas!!!
If anybody has a clue about what is happening, please let me know.
Thanks,
Shmuel
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