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I've been doing some extensive testing with packet loss on speedtouch modems (ST516, specifically) versus other modems.
I'm finding some issues with packet loss under certain traffic mixes, I'm wondering weather it's abnormal. I'd appreciate if I could get some people to test with speedtouches (and a couple without)
0) Disable QoS on the router side for consistency
Test 1
Saturate download with traffic from various linux ISOs and windows service packs
RESULT: no upstream packet lossTest 2
Saturated download + small upload (SFTP upload capped to 20kB/s - Filezilla )
Result: Suddenly tons of UPSTREAM packet loss reportedI find this quite strange behavior, which I've now seen on 3 speedtouch modems (st516x2, st780), and which I've tested with the help of others.
I've also tested 3 non-speedtouch modems, with the collaboration of other owners (SS5360, Speedstream 6520, and some d-link). None of the other modems show any packet loss in the stress scenario described above.
Intuitively, it doesn't make sense that a connection with a saturated download would have near-zero upstream packet loss, and adding a tiny bit of upload sends it into the 2-6% packet loss.
Here are some links if you need to saturate your download
http://mirror.cpsc.ucalgary.ca/mirror/ubuntu.com/releases//lucid/ubuntu-10.04.4-desktop-i386.iso
ftp://ubuntu.arcticnetwork.ca/pub/ubuntu/releases//oneiric/ubuntu-11.10-desktop-i386.iso
http://download.microsoft.com/download/0/A/F/0AFB5316-3062-494A-AB78-7FB0D4461357/windows6.1-KB976932-X64.exe
Packet loss tests be done using the follow site (requires java VM)
»
myspeed.visualware.com/i ··· voip.phpYou can only do 5 tests/day on that site, but you can just choose a different server and do more. Be sure to choose a green "pin" so you can see detailed results.
The main thing i'm focused on right now is upstream packet loss, which can be problematic for applications, I'm assuming.
Here are my typical results on Speedtouch modem with that test & traffic described above.
16mbit dsl, speedtouch (firmware 7.4.3.2)
Upstream packet loss 10.3%
Downstream packet loss 0.4%
3mbit dsl, speedtouch (ST780wl)
Upstream packet loss 1.6%
Downstream packet loss 0.8%
3mbit dsl, non-speedtouch (SS5360)
Upstream packet loss
0.0%Downstream packet loss 0.4%
5mbit dsl, non-speedtouch (dlink)
Upstream packet loss
0.0%Downstream packet loss 0.6 %
Downstream packet loss is very similar across the board (and seems normal, small number of packet drops, downstream is completely saturated, this is very acceptable)
Upstream packet loss, however, is constantly at 0.0% on non-speedtouch modems.
Anyway.. all feedback is welcome. I did not do any comparisons for jitter.