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Hi,
We have been using LTSP for a school and library computer lab of roughly 35 clients. For the most part, LTSP has worked well, but we have had some issues with lag when many students are using the lab. This is particularly the case when users are running flash-based multi-media pages. We are currently running Ubuntu 10.04 and our server is a HP-Proliant-ML350-G6 with two quad core processors and an ATI ES1000 graphics card and 16GB of RAM. The graphics console on our server runs *very* slow and an Xorg process is often pegged near 100% CPU utilization on one of our processors. We are wondering if this might be also effecting the performance of our clients. Our clients are Zotac Zboxes all connected via 1Gbps network connections. We are preparing to upgrade the server in hopes of improving performance, but thought we would consult the LTSP community first for some advice... Here are a few of our questions: 1) When selecting a new server, does the video card on the server matter when it comes to LTSP performance? ie. does the video driver on the server come into play with the LTSP libraries, or are all remote client video operations strictly handled as abstract Xorg graphics calls that are forwarded to the client hardware? 2) We have tried running client browsers as a local app - this greatly helped with the lag issue, but we ran into complications with "helper apps" ie. when users click on a .doc or .pdf file, the browser attempts to launch the helper apps locally (LibreOffice or PDF readers etc.) and fails. We dont want to install every possible helper app as a local app. Is it possible to run the browser as a local apps but launch helper apps remotely on the server? Also, is Chrome or Firefox better when running as a local app? 3) We plan to upgrade to Ubuntu 12.04. Is it better to run the Ubuntu Server version of the Ubuntu Desktop version? I recall reading once that the server version installs a kernel with different optimizations (is this still the case?) which could have issues for LTSP responsiveness (different tuning of throughput vs. latency). 4) Some of our user's home folders on our thin client server were mounted to a remote file server using NFS (connected on a separate subnet via a separate ethernet interface). We noticed significant performance differences compared with users with local accounts on the thin server. Does anyone have any sage advice on what might improve the performance? thanks in advance, Derek |
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