[K12OSN] Relative performance characteristics

[Nadav Kavalerchik]

we use (intel 830 model - pentium 4 ) 3.2 GHz with 2 GB RAM to serve 25
clients

On 1/8/07, "Terrell Prudé Jr." <microman at cmosnetworks.com> wrote:
>
>  Sounds like your issue is DRAM.  Depending on the apps running (e. g.
> TuxType), it could also be server bandwidth, but from what you describe, it
> sounds like you're starting to swap to disk once you hit 60 clients.  That
> will definitely slow any kind of terminal server, including LTSP servers, to
> a crawl.  You might not have any DRAM hogs, but if you've got a bunch of
> instances of an app running, all using a certain amount of DRAM, that adds
> up.  For that reason, I normally didn't push my servers, which generally
> have 4GB DRAM, past 30 clients.  Since you're only at 65% CPU usage, it
> really doesn't sound like that's your problem.  Also, make sure that you are
> indeed checking that *all* of your server's CPUs are seeing only 65% usage.
> By default, top shows only an average between all of them.
>
> --TP
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>
> Immanuel Derks wrote:
>
> Hi all,
>
> Just wondering at the moment how people feel about the difference in
> performance characteristics between the latest Xeon core duo breed
> processors and the old fashioned dual Xeon server layouts for LTSP.
>
> We have multiple IBM X235/x236 with double Xeon 3GHz processors
> outfitted for a failover LTPS configuration at our school (80-100
> clients) and are wondering whether we can simplify the configuration by
> making use of a single server with double Xeon dual core processors (say
> an X3650 that comes with 2 dual-core Xeon 2.33/2.66 or 3.0GHz)
>
> Can anybody testify a configuration with similar loads who made such a
> swap? I know dual core processors don't have a similar performance as 2
> separate xeons at the same speed, but one might wonder with all the
> threaded apps en memory use in LTSP, that it could stack up to it...
>
> I must say I feel a bit skeptical sometimes at the performances quotas
> that I sometimes see here on the list, since we noticed (even on our
> glass backbone) that x236 servers with 3GHz processors and 8GB ram
> fitted are really dropping performance to a slow when 60 people login (2
> classes) and start working on office and firefox stuff at the same time.
> That's why we needed 2 similar servers and we are doing fine now.
> As soon as the CPU loads get over the 65% peak loads, we get a real drop
> in performance, but no iowait or memory hogs or anything....
> (we basically run standard RedHat 4 edu edition)
>
> Kind regards,
>
> Immanuel Derks
>
>
>
>
>
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