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RE: [K12OSN] speed question



Well that’s almost disappointing. My boss wants to buy a whole new lab of thin clients and LCD’s. I wanted to use my current lab, all the iPaqs, and possibly get new monitors, I’d rather use the money on a server and new network equipment. The problem is then, if I go with our current computers, they probably won’t be good enough for the multimedia applications. They are on the i810 chipset, but unfortunately don’t support any upgrades aside from memory. So what thin client would someone recommend for use in a multimedia environment? They don’t have to be tiny, but the iPaqs are a small form factor pc, about the size of Dell GX150s, and that’s all the space I have. I may have to check with the teachers and see if they even let the students do much in there as far as videos go, because I like how well these iPaqs work. Anyone know if you can still buy them, even used?

 

Levi Kemp

Technology Specialist

Bolivar R-I School District

417-328-8943

lnkemp bolivar k12 mo us


From: k12osn-bounces redhat com [mailto:k12osn-bounces redhat com] On Behalf Of "Terrell Prudé Jr."
Sent: Thursday, April 05, 2007 3:50 AM
To: Support list for open source software in schools.
Subject: Re: [K12OSN] speed question

 

I haven't myself used the onboard Intel chipsets on LTSP terminals--my thin clients are a bit old for that--but there's no reason why it shouldn't work just fine.  X11 does support the integrated Intel video, including in 3-D mode.

However, note that the early onboard Intel graphics did rather suck for performance.  That includes the i740 and, to a lesser extent, the i810.  What that means is that, if you're using something like, say, MPlayer to watch video on a LTSP terminal, the clips need to be low-res.  For the higher-res (i. e. 640x480) video, even an ATI 3D Rage Pro isn't fast enough; I needed to pop in that Matrox Millenium G400.  This is on an AMD K6-300 with an AGP slot.  That Millenium G400 made *all* the difference.  Same with an ATI Radeon 7500 that I've got lying around; that did the trick, too.

Your server's video card performance is totally orthogonal; it has nothing to do with what happens on the thin client.  Nothing, nada, el-zippo.  However, your server's CPU oomph can become an issue, depending on how many simultaneous streams you have going.  My server at home, a dual Athlon 1.2GHz, can comfortably handle eight sessions, nine if I push it a little, before I peg both CPU's.  But the server's CPU performance is a codec issue, not a video display issue.  If you have an 8-core Opteron 2.8GHz monster box that can stream boatloads of simultaneous sessions without breathing hard, but your thin clients have sucky video chips, it's gonna be slow.

Bottom line: if you're going to stream video, what your clients need isn't a killer CPU; a Pentium-166 is enough.  What they need is a good video chipset.

Now, that said, if, in your testing, you find that those clients of yours just don't cut the mustard for video streaming, they're still great for just about every other task, including TuxType and maybe even ChildsPlay.  So they don't necessarily need to become expensive doorstops.

--TP

_______________________________
Do you GNU!?
Microsoft Free since 2003--the ultimate antivirus protection!



Kemp, Levi wrote:

So as far as video goes, what about onboard Intel? We have a lot of Compaq, Dells, etc, that have Intel chipsets, Intel Video, Intel NIC, all onboard. They seemed to run fine, but say for instance I tried to run one of the science apps, astronomy one I think, it did nothing. Where I could use the same app on my Server which had a different video card. The ones I’m mainly going to be using are iPaq, 500Mhz Celerons, with 256MB, and all onboard Intel stuff(there’s no room for pci, or any expansion slots). I want the Lab to be able to do some multimedia stuff, is that going to be an issue, or will I just need to beef up the server?

 

Levi Kemp

Technology Specialist

Bolivar R-I School District

417-328-8943

lnkemp bolivar k12 mo us


From: k12osn-bounces redhat com [mailto:k12osn-bounces redhat com] On Behalf Of "Terrell Prudé Jr."
Sent: Tuesday, April 03, 2007 11:14 AM
To: Support list for open source software in schools.
Subject: Re: [K12OSN] speed question

 

If you're running apps locally on the thin client, then yes.  Otherwise, I haven't seen one whit of difference.  The CPU's on my thin clients range from Pentium-133 to Pentium II-300.  Not a single one of them "feels slow."  I do MPlayer video and all that good stuff on the thin client, at 640x480, with no framedrops.  Remember that, in pure LTSP mode, your CPU is pretty much only running Linux, dhclient, bash, and X11, and you can do that with a 486-33.

Here's what I *have* seen make a difference, though.  The first is the use of 100BaseTX on the client.  Yes, you can do it with 10BaseT, but not if you want TuxType or ChildsPlay to actually play smoothly.  :-)  The second is the need for a good--and FOSS-friendly--video chipset.  That means that any nVidious chipsets are *OUT*.  Why?  They're just too closed, even with their specs, just like ATWhy is in recent years.  Either of these issues can make your thin client feel sluggish.

Here's a case in point.  I got my hands on a recent nVidious card, thought, "hey, plug it in and go!", and discovered that even 2-D performance was D-A-W-G S-L-O-W.  The reason was that the universal, but slow, VESA driver got autodetected, since nVidia is definitely *not* FOSS-friendly.  Oh, I'm sure that I could've made a manual entry in lts.conf to point to the 2D-only nv driver.  But, since I use multiple types of old PC's with multiple video card types, I chose not to play that game and simply went with a video board that actually is F/OSS friendly (ATU Radeon 8500 and previous, Matrox Millenium G400's, and so on).

--TP

_______________________________
Do you GNU!?
Microsoft Free since 2003--the ultimate antivirus protection!



Daniel Kuecker wrote:

I was wondering if anyone could tell me if there is a big difference
between an 800 mhz and 200 mhz cpu for thin clients? I have devonIT
6020's and they seem to be smoking fast. I just got some eBox-2300 and
they are pretty sweet, but they seem awfully slow compared to the
devonIT. Is it the CPU difference?
 
Thanks.
Daniel
 
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