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digitalepsilon

41 posts

Geek


#10998 24-Dec-2006 19:45
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I'm not sure if this is a TelstraClear issue, or a PC issue but I thought I'd ask other forum members to see if they find a similar limit. Note that what I'm saying below is not at all a complaint about the service I'm getting.

I'm on the 10Mbit/80GB cable plan. I have solid 9000+kbit speed test results so my connection is good.

If I download a well-seeded torrent (say, 3000+ peers), and I have solid connections to maybe 300 of them, the fastest download speed I've ever seen is 300KB/sec (with an average of maybe 100KB/sec) in over 12 months of use with Azureus. I'm not running via a router.

Somewhat disappointed with that, I signed up for newsgroups access (which has all the content I'm after anyway, particularly 1080i stuff), and now I hit 750-980KB/sec for every download. I download off some USA newsgroups servers over 10 concurrent connections. I don't know if it's possible to hit those speeds with just one connection.

I would have figured that bittorrent would max out my incoming bandwidth, but it never seemed to come close. Assuming there's no traffic shaping going on, has anyone else on TelstraClear 10Mbit managed to see high download speeds (relative to your capacity) with a torrent? I thought perhaps it was just my PC since that many peer connections does stress out my A64.

Cheers


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lchiu7
6521 posts

Uber Geek
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Trusted

  #56315 25-Dec-2006 00:12
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On 10 Mbs/2Mbs 40G plan, on a well seeded torrent. I got 650KBs the other day.  Perhaps your upload speed is set too low so Azureus capped your download?

BTW this wasn't normal - it was the Star Trek New Adventures which are enthusiasts shows, supported by Paramount/Fox (?) and distributed via BT so perhaps their configuration was better than the usual BT. But it did show what could be achieved, speed wise.




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barf
643 posts

Ultimate Geek


  #56320 25-Dec-2006 11:59

if you take all the brakes off Azureus using a well-seeded torrent you'll quickly encounter the limit of 50 sockets in the SYN half-open state (SYN no ACK yet) introduced into Windows XP in Service Pack 2
install the tcpip.sys hack and see if that helps?




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digitalepsilon

41 posts

Geek


  #56330 25-Dec-2006 16:14
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Cheers for the advice. I hacked my tcpip.sys library as soon as SP2 came out. I do check the event log regularly to make sure it isn't quietly "fixed" by windows update. I try to set my upload to 96-128KB/sec (768-1024kbit) though deciding how many upload slots to allocate that bandwidth over to seems to be a bit of an art and depends on the characteristics of the torrent. I never did see sustained torrent download speeds over 300 even with the brakes off. My A64 can handle up to 400 connections (encryption on) until the CPU overhead gets way to high to even use Word. I figured that would give me the best chance of getting connections to generous peers, but it never seemed to.

Anyways, it's not so much of an issue now since I use the newsgroup servers instead.

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