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Piggy-Back Effect


spyder

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Posted

Good morning.

Can anyone explain the following, which often occurs with whatever settings (and combinations thereof) of things like slots-per-torrent, connections, etc., and firewall and antimalware on or off...

Example:

This morning I had torrent A downloading at an average of about 110 kBs.

I started another torrent (B) for the same file, but from a different tracker.

Both torrents had similar seed and peer availabilities.

As the download speed of torrent B increased, so did that of torrent A, until both were coming in at around 230 kBs, each.

If I stopped either of the torrents, the speed of the remaining one fell again to around 100 - 110 kBs.

So downloading two torrents of a file often gives me a completed file in approx. half the time that a single download would.

uTorrent 1.7.7

WinXP HE SP2

ZA 6.1.744 'Free'

'Usual' uT settings (varied according to whim and for experiment):

- Global max upload (kB/s) 30

- No. of up slots per torrent 6

- Global max connections 90

- Max peers per 40

- Alternate up rate 40

Nominal Internet speeds 512kbs/1Mbs

Regards,

s.

Posted

seems like an error in your "nominal" speeds (=max). 1Mbps (or 512kbps) < 460kBps ... anyways, it's not very likely to be possible unless there is a bug in the speed measurements.

Posted

Hi.

Oops... Typo!

"512kbs/1Mbs" should have been "512kbs/10Mbs"

The internet connection's UPLOAD max is, as said,

- nominally (i.e., isp quoted): 512 kb/s;

- actual: tests between 340 kb/s and 520 kb/s, averaging 468 kbs.

s.

Posted

Try a higher upload speed max, especially the alternate upload speed max while not download.

My guess is if you're uploading at 40 KiloBYTES/second then you're probably able to get at lesat slightly faster download speeds than you do now.

Posted

Hi.

Varying the upload speed settings (Global max. and alternative max.) has no effect on the phenomenon I described - as far as I have been able to observe.

I'm not grumbling about this: I'm quite happy with the general performance of my installation (e.g., I downloaded a file this morning at a steady 1.1 MBs, with a healthy accompanying upload rate).

It just intrigues me.

I don't think it is a uTorrent-specific effect and I know of an Azureus user who has also observed it. I think it's something to do with bittorrent in general, and was curious to know what the cause might be.

Thanks for your interest.

Regards,

s.

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