OK, I just found a Firefox setting that disables double-buffering. In the URL box, enter:
about:config In the filter box, type "double", and you should see the setting: viewmanager.do_doublebuffering Double-click it to set it to "false", then restart Firefox. While you may get some flicker, this dramatically reduced the network bandwidth when scrolling the most gaudy pages I could find on the web (particularly floating text-on-background can really use terminal bandwidth). This might also help your XUL app. -Todd Todd Shoemaker wrote: > Jef- > > The first thing to do is figure out why it is unusable. I'm assuming > the performance is slow. This is usually caused by too much network > traffic. There may be better tools out there, but I usually just run > the classic xosview, which will tell you how much bandwidth the server > network cards are using: > > xosview -load -page -int +net > > You may have to install this app to run it, but it is a handy tool to > have. Otherwise, there are many network load monitors for Gnome, KDE, > etc. Run the XUL app and look at the network usage (ideally, there > won't be other clients in use at the same time). If you are running > 100Mbit cards to the terminal, then network usage will likely sustain > around 8-9MB/s (that's megaBytes, not megaBit), which is the limit of > 100Mbit networks. > > OK, assuming the network is the limiting factor, why does this happen? > Because the application is drawing everything to a back buffer in > memory, and then blasting the whole buffer to the screen at one time. > This makes local applications flicker-free, because the eye doesn't see > drawing operations happening as they progress across the screen, and > once the drawing is complete in the back buffer, it is easy to move the > whole rectangle to the graphics card in one shot. However, for a > network terminal, moving that whole rectangle dozens of times per second > over the wire is very inefficient, especially since only a few pixels > change from one frame to the next. If this is happening in your XUL > application, the only way to make it work efficiently over a remote > display is to somehow disable the back buffer. > > This is also why Java Swing/2D applications run poorly over a remote > terminal, unless you pass in the "-Dsun.java2d.pmoffscreen=false" option > to java, which disables the offscreen buffer and greatly improves remote > performance. > > Hope this helps, > > -Todd > > > jef peeraer wrote: > >> i have an xul app ( remote ) that's intended to run on thinclients. It >> runs ok on a single client, but on thinclients it's almost unusable. >> I've googled and found some posts about it, but it's still a bit >> unclear. Do i have to disable the caching of firefox ? ( which seems to >> take up a lot of memory on the behalv of x11 ) ? Or maybe i should try >> to run firefox locally ? >> >> jef peeraer >> >> ------------------------------------------------------------------------- >> Take Surveys. Earn Cash. Influence the Future of IT >> Join SourceForge.net's Techsay panel and you'll get the chance to share your >> opinions on IT & business topics through brief surveys - and earn cash >> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >> _____________________________________________________________________ >> Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: >> https://lists.sourceforge.net/lists/listinfo/ltsp-discuss >> For additional LTSP help, try #ltsp channel on irc.freenode.net >> >> > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys - and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _____________________________________________________________________ > Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: > https://lists.sourceforge.net/lists/listinfo/ltsp-discuss > For additional LTSP help, try #ltsp channel on irc.freenode.net > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net
