[K12OSN] Slow speed
mark at tsd53.ca
Sat Jan 22 19:59:05 UTC 2005
This may sound simple but we have noticed a big increase in speed by
decreasing the client resolution. just a thought.
On Sat, 22 Jan 2005 10:37:25 -0500, Jeff Kinz wrote
> On Sat, Jan 22, 2005 at 10:22:05AM 0100, Bjørn Roger Rasmussen wrote:
> > Now with K12LTSP as system the people at the school are complaining about
> > the speed. High response time when they shall start or use normally
> > programs etc.
> > Before I began to run K12LTSP I used Skolelinux
> > school liked that solution, but it was a night mare for me to maintain the
> > network. I did not get any complaint about the speed when I run Skolelinux.
> Does this mean that you used to run all your systems with local hard
> drives? If so, then your current slowness problems is a result of
> either your network, or your server.
> > - Intel P 4 1.6 GHz, 1 GB RAM, 80 GB IDE harddisk WD with 8 MB cache. 100
> > Mbit/s network.
> I suspect that since you have a 100 Mbit network, assuming all the
> thin clients are using 100 Mbit cards and not 10 Mbit cards, that
> your problem is your server, not your network. Specifically you have
> three potential weak points in your server.
> 1. For 10-15 X clients, 1 GB of ram is very minimal.
> Depending on what applications are being run, you probably need more
> than that. How to find out: when all your clients are being used (really
> being used, not just logged in) run top and look at how much swap space
> is being used. If you are using a lot of swap that is an indication that
> you need more RAM. What window manager and applications are the clients
> running? Based on my past experience, you need at least 100 Mb of RAM
> for each client even when using a minimal window manager(icewm) and
> doing only internet browsing or word processing. This means that your
> server needs at least 1.5 GB of RAM and based in price points you would
> be better off going right up to 2 GB. Buying RAM in large chunks
> costs less money, and if your client machines are doing anything
> more than a minimal amount of work you will need more than 100MB per
> You may have heard reports of people running 40-100 clients with
> only 1 GB of RAM. This works ONLY when the client machines are not running
> X-Windows (being used only as telnet/terminal appliances).
> 1GB of RAM should be about (USD) $100 - $150
> 2. CPU 1.6 GHz isn't real fast. Evaluate the output of top or
> other load monitoring tools to see if you can benefit from a faster
> CPU. A 3 GHz P4 runs about (USD) $300.
> 3. Disk. If you are hitting the disk for swap space definitely
> upgrade your RAM first. Then, if the applications are still making heavy
> use of the disk, you may want to upgrade to a disk with more cache
> and/or a faster transfer rate. SCSI and SATA are both generally better
> than IDE, albeit more expen$ive.
> 4. (4 of 3 :) Network architecture - make sure all clients are
> running at 100 Mbits and not 10 Mbits. Make sure all switches or
> hubs repeaters, and cards are running full duplex mode. Make sure
> all the cabling is clean with no reflections (reflections cause
> collisions and retries). Run ifconfig on each client and the
> server to see if any of your machines are seeing collisions.
> > The server shall serve about 10 15 thin client computers. The thin client
> > computers are old computers with specifications running from Pentium 166
> > MHz with 64 MB RAM and better.
> Linux/Open Source: Your infrastructure belongs to you, free,
> forever. Idealism: "Realism applied over a longer time period"
> http://www.fedoratracker.org http://www.fedorafaq.org
> Jeff Kinz, Emergent Research, Hudson, MA.
> K12OSN mailing list
> K12OSN at redhat.com
> For more info see <http://www.k12os.org>
Computer Services Coordinator
Tisdale School Division #53
mark at tsd53.ca
306 873-2352 EXT: 505
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