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I found out the hard way that SlingPlayer performance (throughput) can be severely reduced by improperly set MTU.


Situation: Both my desktop PC and notebook had been getting ~1500Kbps from my SlingBox on my internal network (both wired and wireless). This weekend I noticed that my notebook was only getting ~600Kbps, while the desktop was still able to get ~1500Kbps.


Turns out that I had installed the Cisco VPN client on my notebook, and this had reset the MTU on every network adapter to 1300 (the default is 1500).


Using DrTCP, I reset all the adapters back to default MTU (except the Cisco VPN Pseudo Device), and Viola! - 1500Kbps again.


You can check your PC's setup here: http://www.dslreports.com/tweaks


And you can get DrTCP here: http://www.dslreports.com/drtcp



Suggestion: Given the significant performance impact of this, perhaps the SlingPlayer should check this, and provide an error/warning message. Or, at least, log it in the Status Report.
 

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Originally Posted by SANdood
I found out the hard way that SlingPlayer performance (throughput) can be severely reduced by improperly set MTU.


Situation: Both my desktop PC and notebook had been getting ~1500Kbps from my SlingBox on my internal network (both wired and wireless). This weekend I noticed that my notebook was only getting ~600Kbps, while the desktop was still able to get ~1500Kbps.


Turns out that I had installed the Cisco VPN client on my notebook, and this had reset the MTU on every network adapter to 1300 (the default is 1500).


Using DrTCP, I reset all the adapters back to default MTU (except the Cisco VPN Pseudo Device), and Viola! - 1500Kbps again.


You can check your PC's setup here: http://www.dslreports.com/tweaks


And you can get DrTCP here: http://www.dslreports.com/drtcp



Suggestion: Given the significant performance impact of this, perhaps the SlingPlayer should check this, and provide an error/warning message. Or, at least, log it in the Status Report.
Actually, 1500 is probably not the "perfect" setting. Though it should work better than anything lower than 1400 on any "broadband" connection. It's best to match the MTU to the type of service you have. For example, the research I've done on FIOS indicates 1492 is the best MTU for Verizon's setup. Unfortunately my router only lets me set it from 1440 to 1454. So I set it to 1454 and set my laptop to 1454 and I'm getting a little over 15mb/s (up to 15.54mb/s).


There's a good tool at speedguide.net called "SG TCP Optimizer" that has some tests, one of which determines the best MTU to set for your current connection. Maybe because of my router, it always seems to like 1454 as the best MTU.
 
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