[streaming] Streaming problems through a 100M interface

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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