OS/2, eCS & ArcaOS - Technical > Networking

Moved to UltraFibre 120 Mb/s but OS/2 chugs at 10 Mb/s...???

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Andi B.:

--- Quote ---...OR using a utility under Windows or Linux to simplify getting the data you need...
--- End quote ---
Can you recommend a useful utility for that? I'm not very experienced with Linux but I've an Ubuntu installation on one of my systems which I can try.

I've some WinXP/7/10 notebooks too. Usually I avoid connecting them directly to my ADSL router. But if there is a good Win tool which gives me the proper values for my connection I'll use Win for this task. Thanks.

Ian Manners:
Hi Andy,

I used Wireshark.

I'm having a look at whats available via a link way up above at https://www.speedguide.net/analyzer.php
The links given under "Optimize Your Connection" seem to be quite good.

https://www.speedguide.net/articles/the-tcp-window-latency-and-the-bandwidth-delay-2678 is a good summary.

I will also throw in https://www.ibm.com/support/knowledgecenter/ssw_aix_72/performance/tcp_workload_tuning.html for more information though much of it is not relevant to OS/2.

There is a Windows based optimiser available here: https://www.speedguide.net/downloads.php
I have not tried this one but the rest of the information they give seems good so worth a try. I originally tried Wireshark under Windows 10, gave up and used Windows 7 were I got some good results.

maxwarp:
Ian, i'm sorry

so if i've a 100Megabit/sec FTTC i should set as RWINsize

1022208 (30-100 Mbit lines depending on latency. MSS * 44 * 2^4)

that of course with eCS/AOS is not possible since we have a max value is 246723
so you are saying that we can't have download faster than a 15Megabit/sec connection (i'm just guessing)

but it's not, since here i've 2 servers and on one i get downloads of about 6,9-7MegaBytes/sec

i'm now very very confused :)


Ian Manners:
Hi Massimo.

goto https://www.speedguide.net/analyzer.php

What does it say your "RWIN Scaling (RFC1323) = 2 bits (scale factor: 2^2=4)" is?

and what value does it give for "Unscaled TCP Receive Window"?

What you are looking for is a MULTIPLE that fits, the size of RWIN is not overly important for us. Ignore the bandwidth * delay product for now. If you are interested you can find more information on that by searching for  RFC1323 and having a read.

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