Hi, On Tue, 22 Apr 2008, David Burgess wrote:
> I have 4 thin clients booting pxe on realtek 10/100 onboards through an > unmanaged netgear prosafe gigabit switch. If I run a youtube video on one > client, video and audio are reasonably smooth. If I play the same youtube > video on all 4 clients simultaneously the video gets much slower. If I > full-screen a couple of those then the audio starts to break up. For this > reason I'm fairly confident that this rules out the thin client hardware; it > must be a bottleneck in the server or network, right? If moving to full screen makes things worse (as opposed to more obviously bad), then it sounds like you have an issue with local network bandwidth. In fairness, full screen video on thin clients is probably not ever likely to work well. The number of full screen refreshes per second is simply too high. Can you play a single client full screen satisfactorily? > That leaves the network. It's tough to say what my network usage is exactly > because my intel cards insist on reporting bandwidth usage as a sine wave in > gnome (http://ubuntuforums.org/showthread.php?t=750910), but a single client > peaks around 10 MB/s while all 4 running at default size or full-screen > peaks about 28MB/s, suggesting a mean throughput of about 14 MB/s or so on > both interfaces. I'd suggest you set up munin on the server. You can then monitor the server network card usage. http://www.ubuntugeek.com/monitoring-servers-and-clients-using-munin-in-ubuntu.html http://www.ubuntux.org/monitoring-servers-and-clients-using-munin-in-debian-linux > So am I stuck at 100mbps on my client network? Why would this be when my > switch indicates 1000mbps to the server, and ethtool agrees? Each thin client should be limited to 100Mb. That may be the bottleneck playing full screen video. > Is there some other bottleneck happening here that I'm overlooking? Perhaps the video rendering on the thin client could be a problem too -- though they shouldn't affect each other in that. Have you looked at the cpu usage on them. Gavin ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _____________________________________________________________________ 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
