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Thread: Ktorrent freeze and Firefox

  1. #1

    Default Ktorrent freeze and Firefox

    I've run into a peculiar problem. When I open a magnet URL in Firefox, ktorrent will start downloading but will completely freeze after a short period of time. My estimate is anything between 20 seconds and 1 minute. Downloading halts (can see a sharp decline in network utilization in ksyshuard) and ktorrent UI becomes completely unresponsive. Trying to close it produces kwin's terminate application prompt. If I do terminate it and relaunch it, downloading resumes to completion without any further freezes. Now, for the odd part. If I instead close Firefox, the ktorrent's UI immediately becomes responsive and downloading resumes. This leads me to believe it's the parent process of ktorrent that causes a lockup. Ksysguard points at kmozillahelper as the parent process. This would also be consistent with terminating ktorrent and manually relaunching it, thereby effectively changing it's parent process.

    My setup is very close to pure openSuse defaults:
    Code:
    zypper lr:
    
    Repository priorities are without effect. All enabled repositories share the same priority.
    
    # | Alias                               | Name                        | Enabled | GPG Check | Refresh
    --+-------------------------------------+-----------------------------+---------+-----------+--------
    1 | Local                               | Local                       | Yes     | ( p) Yes  | Yes    
    2 | http-download.videolan.org-a752b8a7 | VLC                         | Yes     | (r ) Yes  | Yes    
    3 | repo-debug                          | openSUSE-Tumbleweed-Debug   | No      | ----      | ----   
    4 | repo-non-oss                        | openSUSE-Tumbleweed-Non-Oss | Yes     | (r ) Yes  | Yes    
    5 | repo-oss                            | openSUSE-Tumbleweed-Oss     | Yes     | (r ) Yes  | Yes    
    6 | repo-source                         | openSUSE-Tumbleweed-Source  | No      | ----      | ----   
    7 | repo-update                         | openSUSE-Tumbleweed-Update  | Yes     | (r ) Yes  | Yes
    zypper info kmozillahelper MozillaFirefox ktorrent
    Code:
    Information for package kmozillahelper:
    ---------------------------------------
    Repository     : @System                           
    Name           : kmozillahelper                    
    Version        : 5.0.1-2.1                         
    Arch           : x86_64                            
    Vendor         : obs://build.opensuse.org/mozilla  
    Installed Size : 67,2 KiB                          
    Installed      : Yes                               
    Status         : up-to-date                        
    Summary        : Helper for KDE Firefox Integration
    Description    :                                   
        Package providing integration of Mozilla applications with KDE.
    
    
    Information for package MozillaFirefox:
    ---------------------------------------
    Repository     : openSUSE-Tumbleweed-Oss    
    Name           : MozillaFirefox             
    Version        : 51.0.1-1.2                 
    Arch           : x86_64                     
    Vendor         : openSUSE                   
    Installed Size : 107,0 MiB                  
    Installed      : Yes                        
    Status         : up-to-date                 
    Summary        : Mozilla Firefox Web Browser
    Description    :                            
        Mozilla Firefox is a standalone web browser, designed for standards
        compliance and performance.  Its functionality can be enhanced via a
        plethora of extensions.
    
    
    Information for package ktorrent:
    ---------------------------------
    Repository     : openSUSE-Tumbleweed-Oss
    Name           : ktorrent               
    Version        : 5.0.1-2.1              
    Arch           : x86_64                 
    Vendor         : openSUSE               
    Installed Size : 3,3 MiB                
    Installed      : Yes                    
    Status         : up-to-date             
    Summary        : KDE BitTorrent Client  
    Description    :                        
        KTorrent is a bittorrent application for KDE which allows you to download files
        using the BitTorrent protocol. It enables you to run multiple torrents at the
        same time and comes with extended features to make it a full-featured client
        for BitTorrent.

    Has anyone else experienced similar ktorrent freezes/unresponsiveness? If so, have you used Firefox to open/load a torrent file or magnet URL in ktorrent?

  2. #2

    Default Re: Ktorrent freeze and Firefox

    Small update, ktorrent doesn't freeze when a magnet url is loaded from other browsers (tested with qupzilla and google chrome). Here's a more complete view of the repositories used:
    Code:
    pmargeti@loonix:~> zypper lr -d
    Repository priorities are without effect. All enabled repositories share the same priority.
    
    # | Alias                               | Name                        | Enabled | GPG Check | Refresh | Priority | Type     | URI                                                      | Service
    --+-------------------------------------+-----------------------------+---------+-----------+---------+----------+----------+----------------------------------------------------------+--------
    1 | Local                               | Local                       | Yes     | ( p) Yes  | Yes     |   99     | plaindir | dir:///usr/local/repository                              |         
    2 | http-download.videolan.org-a752b8a7 | VLC                         | Yes     | (r ) Yes  | Yes     |   99     | rpm-md   | http://download.videolan.org/SuSE/Tumbleweed/            |         
    3 | repo-debug                          | openSUSE-Tumbleweed-Debug   | No      | ----      | ----    |   99     | NONE     | http://download.opensuse.org/debug/tumbleweed/repo/oss/  |         
    4 | repo-non-oss                        | openSUSE-Tumbleweed-Non-Oss | Yes     | (r ) Yes  | Yes     |   99     | yast2    | http://download.opensuse.org/tumbleweed/repo/non-oss/    |         
    5 | repo-oss                            | openSUSE-Tumbleweed-Oss     | Yes     | (r ) Yes  | Yes     |   99     | yast2    | http://download.opensuse.org/tumbleweed/repo/oss/        |         
    6 | repo-source                         | openSUSE-Tumbleweed-Source  | No      | ----      | ----    |   99     | NONE     | http://download.opensuse.org/source/tumbleweed/repo/oss/ |         
    7 | repo-update                         | openSUSE-Tumbleweed-Update  | Yes     | (r ) Yes  | Yes     |   99     | rpm-md   | http://download.opensuse.org/update/tumbleweed/          |
    

  3. #3
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    Default Re: Ktorrent freeze and Firefox

    A decade ago,
    I wrote about how the default openSUSE is optimized for Personal and Small Server use.
    If you're running a Torrent application with a very large number of connections, and especially for torrent applications that themselves aren't optimized to adjust for active or latent connections, and be able to prioritize for bandwidth, then your openSUSE is actually running like a high capacity server with inadequate networking resources. This can also be exacerbated by the default TCP/IP Congestion Control algorithm, which assumes a stable and reliable wired network connection not subject to various interference.

    The article I wrote still applies to today's current openSUSE, and will likely fix your problem by suggesting a TCP/IP Congestion Control algorithm change and re-allocating system resources from system processing to networking to support larger numbers of networking connections over other networking connections like WiFi, Gigabit, Telco carriers and more (It's also a must-read for anyone running medium or large servers).

    https://sites.google.com/site/4techs...ork-connection

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  4. #4

    Default Re: Ktorrent freeze and Firefox

    I'm already using westwood, so I guess we can rule TCP congestion out? How do you interpret the fact that ktorrent doesn't go unresponsive when invoked through another browser?
    Code:
    pmargeti@loonix:~> cat /proc/sys/net/ipv4/tcp_congestion_control
    westwood
    

  5. #5

    Default Re: Ktorrent freeze and Firefox

    Quote Originally Posted by pmargeti34 View Post
    I've run into a peculiar problem. When I open a magnet URL in Firefox, ktorrent will start downloading but will completely freeze after a short period of time. My estimate is anything between 20 seconds and 1 minute. Downloading halts (can see a sharp decline in network utilization in ksyshuard) and ktorrent UI becomes completely unresponsive. Trying to close it produces kwin's terminate application prompt. If I do terminate it and relaunch it, downloading resumes to completion without any further freezes. Now, for the odd part. If I instead close Firefox, the ktorrent's UI immediately becomes responsive and downloading resumes. This leads me to believe it's the parent process of ktorrent that causes a lockup. Ksysguard points at kmozillahelper as the parent process. This would also be consistent with terminating ktorrent and manually relaunching it, thereby effectively changing it's parent process.



    Has anyone else experienced similar ktorrent freezes/unresponsiveness? If so, have you used Firefox to open/load a torrent file or magnet URL in ktorrent?

    I get exactly the same behaviour in Leap 42.2. Closing Firefox brings ktorrent to life, indeed.

  6. #6
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    Default Re: Ktorrent freeze and Firefox

    Quote Originally Posted by pmargeti34 View Post
    I'm already using westwood, so I guess we can rule TCP congestion out? How do you interpret the fact that ktorrent doesn't go unresponsive when invoked through another browser?
    Code:
    pmargeti@loonix:~> cat /proc/sys/net/ipv4/tcp_congestion_control
    westwood
    
    Why are you using westwood?
    Either look up its description or read the description in my article, it's <sender side only> when you have fat, reliable pipes (like GigE) for Internet connections.
    For most people, their connection is WiFi so should choose something like veno, but you need to evaluate what you have in your network.
    And, as I describe in my article you should also increase the resources allocated to your networking stack... Unless you have something else more important.

    https://sites.google.com/site/4techs...nnection/linux

    TSU
    Beginner Wiki Quickstart - https://en.opensuse.org/User:Tsu2/Quickstart_Wiki
    Solved a problem recently? Create a wiki page for future personal reference!
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