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Old 12th September, 2006, 08:14 PM
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Different jitter test results on different computers from same router

There is a site that has a "jitter" test specifically for VoIP service testing;
http://myvoipspeed.visualware.com/
I have Sunrocket and this is the site they use. I'm having 'audio' issues so they have me running tests here.

What I discovered is the "jitter" portion of the tests shows around one full second (1000ms) on my main tower and around 10ms on my Laptop. I have run the test many times and it is always the same. What is really strange is the Laptop is through a wireless card (only about 3 feet away) while the tower is a wired connection.

The tower is running 2k pro w/sp4 and the Laptop is running XP Pro sp1. Both are using Opera V9 if any of that matters. The router is a Westell VersaLink 327 through Verizon.

Any ideas why this "jitter" is 100x worse on the tower?? Here is a test result of the tower:
Speed test statistics ---------------------
Download speed: 2875640 bps
Upload speed: 739200 bps
Quality of service: 99 %
Download test type: socket
Upload test type: socket
Maximum download pause: 7 ms
Average download pause: 4 ms
Minimum round trip time to server: 42 ms
Average round trip time to server: 43 ms
VoIP test statistics --------------------
Jitter: you --> server: 951.6 ms
Jitter: server --> you: 299.5 ms
Packet loss: you --> server: 0.0 %
Packet loss: server --> you: 0.1 %
Packet discards: 0.9 %
Packets out of order: 0.0 %
Number of supported VoIP lines: 12
Estimated MOS score: 3.4

Here it is from the Laptop:
Speed test statistics ---------------------
Download speed: 2271528 bps
Upload speed: 739200 bps
Quality of service: 72 %
Download test type: socket
Upload test type: socket
Maximum download pause: 78 ms
Average download pause: 12 ms
Minimum round trip time to server: 44 ms
Average round trip time to server: 45 ms
VoIP test statistics --------------------
Jitter: you --> server: 7.9 ms
Jitter: server --> you: 11.3 ms
Packet loss: you --> server: 0.2 %
Packet loss: server --> you: 0.0 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Number of supported VoIP lines: 12
Estimated MOS score: 3.7
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Last edited by videobruce; 12th September, 2006 at 08:19 PM.
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Old 12th September, 2006, 08:20 PM
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My first guess would be that it has to do with the NIC driver and how it is buffering (or not buffering) packets that are sent to the network.
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Old 12th September, 2006, 09:09 PM
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D-Link DFE 530TX+
V5.397
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Old 13th September, 2006, 10:07 AM
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What settings does the NIC driver offer you? You might find there is a setting for "CPU optimisation" or similar.

Also, what Java virtual machine are you using?

Just for comparison, here are the results from my laptop using a wired connection (The pause could be because I'm on a non-switched network, so collisions will have an impact):

Code:
Speed test statistics
---------------------
Download speed: 1948528 bps
Upload speed: 1947080 bps
Quality of service: 99 %
Download test type: socket
Upload test type: socket
Maximum download pause: 181 ms
Average download pause: 6 ms
Minimum round trip time to server: 6 ms
Average round trip time to server: 9 ms

VoIP test statistics
--------------------
Jitter: you --> server: 11.1 ms
Jitter: server --> you: off
Packet loss: you --> server: 5.7 %
Packet loss: server --> you: off
Packet discards: 0.0 %
Packets out of order: 0.0 %
Number of supported VoIP lines: 33
Estimated MOS score: 3.5
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Last edited by Áedán; 13th September, 2006 at 10:12 AM.
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Old 13th September, 2006, 11:42 AM
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Gee, I love your upload speeds............
What service is it? Also, why is the 'server-you' path "off"??

If you are referring to JRE is is Sun V1.50

Anyway. I tried to update the driver for the D-Link DEF-530TX+ NIC, but because of that completely stupid designed driver package 48MB, yes a 48 MB driver package for a silly NIC (includes everything even though you are prompterd to pick your O/S) all I got was it was looking for a file that doesn't exist. Couldn't get it to update so I swapped it out for a Netgear FA311 and all appears ok now. Jitter is right down there with the Laptop.
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Old 13th September, 2006, 11:52 AM
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I have no idea why the server-you path is "off". I was also using the 1.5JRE. The service is an HSDL line - 2M/bit symmetrical.

I wasn't suggesting updating the driver - I know a lot of network cards have settings for CPU usage, and from experience setting it to low CPU utilisation often results in high latency.
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Last edited by Áedán; 13th September, 2006 at 11:53 AM.
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Old 13th September, 2006, 12:06 PM
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Someone else did, so I tried the next (supposely easy) route after the cable swap. Never had a problem with a simple NIC card before in the 7 years and 8-10 boxes I have built ot rebuilt.
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