<html> <head> <style> .hmmessage P { margin:0px; padding:0px } body.hmmessage { font-size: 10pt; font-family:Verdana } </style> </head> <body class='hmmessage'> > Subject: Re: [K12OSN] LTSP CentOS5 slow > From: brcisna@eazylivin.net > To: k12osn@redhat.com > Date: Fri, 28 Nov 2008 08:23:00 -0600 > > Hi Jones, > > Please supply some specs of your server and how many TC's you are > connecting to it.Is this a default install of K12LTSP5, or CentOS5 with > ltsp on top of it? Have you updated the server since a default install? > The FF update shouldn't have hindered the performance any just,, FYI. > A few things to try. > 1. run top from a terminal while the server seems " slow ", and see if > your memory is all used up,or if cpu is 100%. > 2. You could download jperf,and install on your K12LTSP server as well > as a (linux)laptop you have available. Plug your laptop into the switch > that the TC's are plugged into. Run jpef in server mode on the server & > run jperf on your laptop in client mode. You will see what bandwidth is > available along with jitter and all that sorta geeky stuff.This piece > has really helped me in finding were bandwidth is being used realtime. > 3. Is the switch the TC's are plugged into a 'plug and play' switch? In > other words a non-managed switched? > 4. That is odd Firefox is throwing that error you posted. Did you > install FF via yum? Is this error happening every time FF is launched, > or hit and miss? > You can download the jperf rpm at the URL below. You will need to > install iperf, first, which is at the url as well. > > ftp://eazylivin.net/server/jperf/ > > Let us know your findings. > > Take Care, > Barry Cisna > > > _______________________________________________ > K12OSN mailing list > K12OSN@redhat.com > https://www.redhat.com/mailman/listinfo/k12osn > For more info see <http://www.k12os.org> I wasn't able to find the loopback and I'm curious if the switch has green lights because of the possible Wake-On-LAN abilities of the NIC cards. The NIC lights are green when the computer is plugged in but turned off. Currently all 30 TC's are off and its just 1 TC and 1 server. To answer your previous questions: Specs: There are max 31 thin clients. Default k12ltsp5EL 2 15K rpm scsi drives in software raid 1 6GB ram (serving max 30 students at a time) 1. TOP output: top - 16:40:27 up 4 days, 2:10, 7 users, load average: 0.16, 0.24, 0.20 Tasks: 211 total, 1 running, 208 sleeping, 0 stopped, 2 zombie Cpu(s): 2.9%us, 0.2%sy, 0.0%ni, 96.6%id, 0.2%wa, 0.0%hi, 0.1%si, 0.0%st Mem: 3631812k total, 2337164k used, 1294648k free, 357848k buffers Swap: 1036088k total, 160k used, 1035928k free, 1278744k cached [I was tired earlier and Swapped Mem and Swap] Memory looks like its being used up. This is with just 1 TC running. 2. I have both window and Linux in my lab, after reading I noticed that I could install iperf.exe on a Windows client and I won't need a laptop. I had key issues installing iperf on Linux, but it says it installed it. I installed jperf no problem, but when I tried to run it I got this: Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. 3.I believe that the switch is non-managed. We just connected the cables in and away we went. 4. Yes, I installed Firefox with yum. I also updated a couple of times. I updated it again today. Firefox crashes every once in a while. It was crashing more regularly before the update. It seems to be fine when I turn the switch off/on. If its just a couple of users then it seems to be running ok. Once a class gets in its slow again. I'm stuck again. <hr /> <a href='' target='_new'></a></body> </html>