Youtube causing WoW lag

Connection issues, drop outs or speed related faults for ADSL and ADSL2+ services
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ajarm1
Posts: 15
Joined: Wed Jan 10, 2007 2:12 pm

Youtube causing WoW lag

Post by ajarm1 » Tue Sep 22, 2009 8:56 am

I've noticed lately (over the past few months) that if my wife uses Youtube with her laptop that it causes intermittent lag for WoW for me (basically lag spikes of 5-10 seconds every minute or so). I've tried different routers (ZyXEL 2602, Netcomm NB5+4W, Netcomm NB6+4WN) as well as setting up QoS on the router but it seems like the Youtube packets are being prioritised higher from the Exetel side. Would this be the case? Is there anything else I can do to increase the priority for WoW packets / prevent the lag spikes?

Dazzled
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Re: Youtube causing WoW lag

Post by Dazzled » Tue Sep 22, 2009 10:04 am

If you grab the source of a running youtube video, you will see that it is only a heavy dose of browser javascript feeding your flash plug-in from the standard http port. You can see better how it works if you analyse the python script youtube-dl at http://bitbucket.org/rg3/youtube-dl/wiki/Home. If youtube is running successfully you are probably pulling in 150 to 500 KB/s, so it can choke up your bandwidth.

The only easy way you can de-prioritise youtube is at your gateway router, and you will have to degrade all ordinary browser traffic on your wife's machine. Her live youtube will also be unwatchable. I am not brave enough for that, but if you get youtube-dl running on her machine you can download youtube in batches at maximum speed for later viewing in her media player.

ajarm1
Posts: 15
Joined: Wed Jan 10, 2007 2:12 pm

Re: Youtube causing WoW lag

Post by ajarm1 » Tue Sep 22, 2009 12:34 pm

Dazzled wrote:If you grab the source of a running youtube video, you will see that it is only a heavy dose of browser javascript feeding your flash plug-in from the standard http port.
Yeah, I was fairly certain Youtube was just running through port 80. Just wasn't sure if perhaps Exetel is prioritising that over the WoW ports?
If youtube is running successfully you are probably pulling in 150 to 500 KB/s, so it can choke up your bandwidth.
Hmm, rightio, that could explain it. I just didn't expect youtube to pull those sort of numbers.
The only easy way you can de-prioritise youtube is at your gateway router, and you will have to degrade all ordinary browser traffic on your wife's machine.
Yeah, I've already tried putting WoW traffic ahead of port 80 on the router, but like I was saying, that only prioritises it from my end. If Exetel doesn't send the WoW packets through early enough then there's nothing much my router can do.
Her live youtube will also be unwatchable.
WoW doesn't use that much bandwidth - if those packets were being prioritised then youtube wouldn't be affected that much. Besides, I don't think she'd mind that much if it was a little slower, just that at the moment we can't both be doing what we want. Either I lag out in WoW or she can't use youtube.
if you get youtube-dl running on her machine you can download youtube in batches at maximum speed for later viewing in her media player.
That might work. If I could set up a cap on the download rate for youtube then that should free up enough bandwidth for the WoW packets. I'll look into it - thanks.

Dazzled
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Re: Youtube causing WoW lag

Post by Dazzled » Tue Sep 22, 2009 1:19 pm

There are Youtube add-ons for Firefox and Opera as well, (the Opera one is a widget that goes online to http://flashvideodownloader.org) but they are not as fast as youtube-dl.

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