Websites slow when downloading with BitTorrent?

Discussion in 'Cisco/Linksys Wireless Routers' started by GaryKing, Oct 9, 2005.

  1. GaryKing

    GaryKing Network Guru Member

    When I have a lot of connections (~75) in BitTorrent, using the web is slow.

    I have already set the following to high priority:

    Web (port 80)
    SMTP and POP3 (for my email)

    And the following to low priority:

    BitTorrent (port 6969, my BT port)

    And yet when BitTorrent reaches enough connections, then it pretty much renders the browser useless for browsing the web, unless I stop the BT AND I have to restart my computer to be able to use the web again (or reset the router.)

    How can I solve this?

    This is my startup script, by the way:

    echo 4096 > /proc/sys/net/ipv4/ip_conntrack_max
    echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
    echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
    echo 512 > /proc/sys/net/ipv4/neigh/default/gc_thresh1
    echo 2048 > /proc/sys/net/ipv4/neigh/default/gc_thresh2
    echo 4096 > /proc/sys/net/ipv4/neigh/default/gc_thresh3
    echo "600 1800 120 60 120 120 10 60 30 120" > /proc/sys/net/ipv4/ip_conntrack_tcp_timeouts
    Also, on a side note, when I use BT, my download speed apparently drops when I run a speed test. I normally get ~4.5 mbps, but when using BT, it can vary from 2.5 mbps to 1 mbps. Why? This happens even when my BT speeds are slow, such as 90 kb/s in total.

    Thanks in advance!
  2. Soylent

    Soylent Network Guru Member

    Bittorrent is taking up your bandwidth, memory, and CPU power. Your whole computer will run slower with more torrents that are running, so your speed tests aren't going to accuratly depict connection speed. Download and use a bandwith monitoring program instead.
  3. Toxic

    Toxic Administrator Staff Member

    limit the amount of users connecting to you, i find azureus allow for tweaking the amount of connections and upload/download speeds and may help.
  4. algarythem

    algarythem Guest

    Set Upload cap

    Most bittorrent programs will let you set a maximum upload speed. Go to run a bandwidth test and set your upload a little lower (5k or so).


    Last Result:
    Download Speed: 2124 kbps (265.5 KB/sec transfer rate)
    Upload Speed: 358 kbps (44.8 KB/sec transfer rate)

    Make sure you set it based on the KB/sec transfer rate
  5. l31101

    l31101 Network Guru Member

    I have a similar problem. When i'm using bittorrent, the whole internet connection becomes very slow even when the upload/download is less than 10KB/s. Any suggestions?
  6. Toxic

    Toxic Administrator Staff Member

    the slowdown is usually not a download bandwidth problem but what you are uploading. Also the amount of connections you are allowing to your BT program will drastically degrade your speed of normal surfing etc.

    try setting a low upload limit on your BT client. and make the BT service have low priority in the WRT54G QoS settings.
  7. mrbond82

    mrbond82 Network Guru Member



    I've been posting in a bunch of topics that have had the same types of problems. Dead internet, slow torrent speeds, dns lagging, etc.

    The bottom line is that the Linksys firmware is crap and that QoS on ANY firmware is crap because your router can't keep up with prioritizing that many connections (From torrents). The solution is to limit the BANDWIDTH that your torrents use from your torrent program and to NOT use QoS (you won't need to if you limit your bandwidth usage).

    You can read how I fixed the problem in my guide:

    Happy Downloading!
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