Στις 26/07/2013 09:22 μμ, ο/η Mike Cammilleri έγραψε: > Also, iftop on the LTSP server shows ~90Mb/s throughput when I run a > youtube video. That translates to roughly 12 Megabytes per second. I > would think thats not a lot for the switch? The speed of the ethernet > card on the LTSP server is set at 100mb/s, so thats roughly 12 > megabytes. So I guess the ethernet card might be my bottle neck? >
Suppose a user is watching a fullscreen youtube video (it doesn't matter if the video is encoded in low res or not, it's the viewing resolution that matters) in an HD screen. 1920x1080 pixels x 32 bits per pixel x 30 frames per second = 1,990,656,000 bits per second. I.e. for a single client, you'd need 2 Gbps. With X_COLOR_DEPTH=16, just 1 Gbps. If the video wasn't fullscreen but it was viewed in a 480x270 window, then 60 Mbps. On the other hand, if a fullscreen video was displayed with the XVideo technology (e.g. totem or VLC video player), then only the video source resolution would matter, not the viewing resolution (because the scaling then is done client-side), and the bits per pixels would be 12 (that's specific to XVideo), so the required bandwidth would be significantly less: 480*270*12*30=46 Mbps So yeah gigabit at least for the server <=> switch connection is always mandatory for viewing videos on thin clients. Localapps and LTSP fat clients are much better for video reproduction. ------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. Start your free trial of AppDynamics Pro today! http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk _____________________________________________________________________ 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
