Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[burakkucat]

@Burakkucat - Isn’t your downstream sync rate really high just now ? Or am I just forgetting. Looks pretty good anyway.

I currently see a synchronisation speed of 5735 kbps DS & 1019 kbps US and a throughput speed of 4.56 Mbps DS & 0.98 Mbps US.

[Weaver]

A long time question : since line #3 upstream is so low compared to the others, will TCP get confused by the varying delay times of packets depending on whether they went up through the fast line #1 or the slow line #3 ?

[burakkucat]

That is a query for someone who understands the mechanism of line bonding. It's something I can not answer and I would not like to guess.

[Weaver]

I see, a clever transmitter might tweak the times of transmission of the packets in order to be kind to TCP ? Or not. I’m assuming that in the latter case the values of the difference (tcp_tx time - arrival_time) might go up and down as the different lines are used and a TCP implementation observing transit durations in order to control TCP’s behaviour might get confused because one moment it’s seeing a 300kbps link and the next a 500kbps link. And that could muck up TCP’s delay/RTT-related algorithms, Does that seem a reasonable guess?

[burakkucat]

I'm struggling to formulate a picture (either murky or clear) . . .

[Weaver]

Me too. Perhaps someone who is good at deciphering detailed TCP behaviour from a pcap snapshot of traffic taken during an upload could comment? I’ve forgotten - I used to have a good technique for starting a long upload, tried this which got appallingly low results: https://testmy.net - Be aware, must select a UK server as it defaults to US-based ones, stupidly.