Dwindling Download Speed

[gaeill]

I know that there has been a reference to this before many times in this forum. But I need a refresher.
When I start to download a 5meg or greater file- my download speed will start off fine and as the download continues past maybe the first 3 megs, the speed drops significantly off(as much as 1 mb/s). Is this an RWIN issue, need to calculate for a higher latency or what? Downloading a 64meg file averages a speed at about 75% of my caps. Suggestions please. thanks

[mnosteele52]

When you start a download, the server sends an RWIN of data to the user, and that data stays in the TCP/IP RWIN buffer until the user tells the computer where to put it, in the case of a file download. The downloading program then reports the speed at whcih the data was transferred from the buffer to the drive, not the speed at which the data is transferred over the net. It's how TCP/IP works, there is no need to change anything to try and compensate or fix it.:) ;)

[gaeill]

I guess this opens up another issue regarding speed testing. When downloading a test file of anything over 3 megs, I do not reach 90% of my caps(usually 70%). Anything less than 3, I either surpass my caps or am in the steady 90% category. I see others in this forum testing consistently high with a speed test downloading a large file 64megs. Are we still talking the same thing here, ie that this is the basic nature of TCP?

[Lobo]

Get more RAM:)

[gaeill]

I've got 512

[mnosteele52]

Originally posted by Lobo
Get more RAM:)

That has nothing to do with downloading files.

It's normal for this to happen gaeill, it does it to me sometimes, if your speed was really suffering I would suggest there might be a problem but I wouldn't worry about it if I were you.:) :D

[Lobo]

I don't care what anyone says, you cannot maintain your speed on large download without enough RAM, 512 is enough:)

[mnosteele52]

Originally posted by Lobo
I don't care what anyone says, you cannot maintain your speed on large download without enough RAM, 512 is enough:)

OK, then elaborate on how more RAM will improve your large downloads.:)

[gaeill]

Thanks for all help. It's a miserably cold day here in Maine and I have nothing better to do than nit-pik at my system- which by the way is running so much better with SP1(Big decrease in CPU utilization and ram in normal operations)

[Lobo]

Just maintains your speed instead of running out of memory

[mnosteele52]

Originally posted by gaeill
Thanks for all help. It's a miserably cold day here in Maine and I have nothing better to do than nit-pik at my system- which by the way is running so much better with SP1(Big decrease in CPU utilization and ram in normal operations)

Yeah I've notices SP1 to improve the performance of the pc's I've installed it on.:) ;)

[mnosteele52]

Originally posted by Lobo
Just maintains your speed instead of running out of memory

Lobo, don't start this nonsense again, that statement makes no sense at all. TCP/IP uses no RAM, show me in the White Papers where it says more RAM will improve your bandwidth. The only thing you may need more RAM for is if you use AFD values which utilize RAM for increased performance, but they only use what you allow them to use... they don't use more and more over a large download.:) :D

[Andrzej]

hehehe again the same :D
newer ending story...
1Q dwl file 64mb with yours ram32mb PC ?
2Q dwl the same file with PC ram512mb ?