[streaming] Streaming problems through a 100M interface

[Shmuel Vagner]

Problem solved!
It was the setting of the NIC after all.
As soon as I turned off the interrupt moderation rate (The default settings on the Lenovo is 'adaptive') the VLC started streaming without problems.
Shmuel


-----Original Message-----
From: Marshall Eubanks [mailto:tme at americafree.tv] 
Sent: Sunday, August 16, 2009 10:26 PM
To: Shmuel Vagner
Cc: streaming at videolan.org
Subject: Re: [streaming] Streaming problems through a 100M interface


On Aug 16, 2009, at 2:47 PM, Shmuel Vagner wrote:

> Thanks for the tips Marshal,
> I am using UDP and the stream continues to be streamed even after it  
> is stuck on the receiver (I verified it using Wireshark both on  
> transmitter and receiver sides). The streaming rate is steady 8Mbps  
> and it just not enough for a 15Mbps stream.
> I also initially thought that it is an interface auto-negotiation  
> problem, but if it was the case I could not have streamed 95Mbps  
> with IPERF on an identical setup.

Are you sure ? Could you directly verify your sender and receiver side  
configurations? Mis-configurations can behave non-intuitively.

Regards
Marshall


> Shmuel
>
>
> -----Original Message-----
> From: Marshall Eubanks [mailto:tme at americafree.tv]
> Sent: Sunday, August 16, 2009 9:15 PM
> To: Shmuel Vagner
> Cc: streaming at videolan.org
> Subject: Re: [streaming] Streaming problems through a 100M interface
>
> I don't regard your tests as conclusive regarding switches, etc.
> (I.e., I don't think you can necessarily jump to conclusions A,B,C).
>
> Run tcpdump or ethereal on both laptops and see what happens when the
> stream stops. Does it really stop, or just drastically slow down, are
> errors being generated, etc.
>
> It sounds to me like you might be using tcp streaming. Verify from
> packet inspection whether or not you are streaming UDP or TCP.
>
> If you transfer a large file (several GB) using tcp from Lenova -> HP,
> what sort of performance do you get ? (I would use tcp or ftp for
> this.) Does this stop after 1 second, or drastically slow down  
> or ... ?
>
> Check to make sure that you do not have Ethernet duplex mismatching
> issues (for example, that the Lenova doesn't autoconfigure the
> connection to 10 base T). That would give you about 8 Mbps throughput,
> by the way.
>
> Regards
> Marshall
>
>
> On Aug 16, 2009, at 11:53 AM, Shmuel Vagner wrote:
>
>> 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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>
>
>
>
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