[K12OSN] K12OSN Digest, Vol 75, Issue 7

Mathieu Pelletier mpelletier at tcz.co.zw
Sat May 15 18:07:01 UTC 2010


Thanks for the pointers, Almquist.   I have turned down the resolution 
to 16, though I may go lower as a stop-gap measure until I get my new 
switches.  My setup is a mixed environment where my server is a dhcp 
server for both my larger network and for my ltsp clients, thus I have 
two nics.  One of the nics I have designated to serve the clients and 
the other to server the rest of the network.  I might actually pop in a 
third gigabit card as you suggested, but I am not sure how to "trunk" 
the two cards together as you mentioned.  Do you have any instructions 
on how to do this, or should I just 'google' it?

~Cheers,

------------------------------------------------------------------------
Mathieu Pelletier
Biblical Studies Department
Theological College of Zimbabwe

Tel: +263 9 287032/3 Ext: 214
mpelletier at tcz.co.zw <mailto:mpelletier at tcz.co.zw>
www.tczonline.com <http://www.tczonline.com>
Chat Google Talk: mkpelletier Skype: mathieu.pelletier


On 05/15/2010 06:00 PM, k12osn-request wrote:
> Send K12OSN mailing list submissions to
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>
> Today's Topics:
>
>     1. Re: Clients freezing (Mathieu Pelletier)
>     2. Re: Clients freezing (Almquist Burke)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 14 May 2010 23:24:03 +0200
> From: "Mathieu Pelletier"<mpelletier at tcz.co.zw>
> To: k12osn at redhat.com
> Subject: Re: [K12OSN] Clients freezing
> Message-ID:<4BEDBF73.2000604 at tcz.co.zw>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>
> Thanks for this confirmation, William.  I had begun to suspect that this
> was the problem and I have already planned to replace the switches due
> to some faulty ports (thanks to a lightning strike).  Anyway, can you
> confirm that a 10/100 connection on the client should be enough as long
> as the server is using a gigabit NIC?  The server already has the
> necessary NIC, but the 10/100 switches were purchased for a steal a
> little while ago before we went to thin clients.
>
> Thanks again... This is a relief knowing that it is not a problem with
> my configuration files.  Are there any special configuration tricks I
> can employ in the interim that might lessen the saturation?  I am
> already running Firefox and OpenOffice as local apps.
>
> ~Cheers,
>
> ------------------------------------------------------------------------
> Mathieu Pelletier
> Biblical Studies Department
> Theological College of Zimbabwe
>
> Tel: +263 9 287032/3 Ext: 214
> mpelletier at tcz.co.zw<mailto:mpelletier at tcz.co.zw>
> www.tczonline.com<http://www.tczonline.com>
> Chat Google Talk: mkpelletier Skype: mathieu.pelletier
>
>
> On 05/14/2010 06:00 PM, k12osn-request wrote:
>    
>> Send K12OSN mailing list submissions to
>> 	k12osn at redhat.com
>>
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>> or, via email, send a message with subject or body 'help' to
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>>
>>
>> Today's Topics:
>>
>>      1. Re: Clients freezing,	server losing network (Mathieu
>>         Pelletier) (William Fragakis)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Fri, 14 May 2010 11:22:43 -0400
>> From: William Fragakis<william at fragakis.com>
>> To: k12osn at redhat.com
>> Subject: Re: [K12OSN] Clients freezing,	server losing network (Mathieu
>> 	Pelletier)
>> Message-ID:<1273850563.11510.6.camel at localhost.localdomain>
>> Content-Type: text/plain; charset="UTF-8"
>>
>> Your network is simply saturating.  When I first set up a K12ltsp
>> system, we would saturate 10/100 at anything over 5 clients on a server
>> using anything that was graphically intense (Flash, Tux Math, etc.). The
>> symptoms were exactly as you described. The packets start colliding and
>> things go downhill quickly.
>>
>> Now, at home, using an Athlon X2 and just a couple of Atom clients and
>> integrated intel video, I see a big difference in full screen youtube
>> videos going from 10/100 to gigabit . I've gone from maybe 1-2 fps to
>> 8-10 fps. Even though it's a small network, for grins, I decided to see
>> if upgrading to gigabit would make a difference. I was surprised how
>> much a difference it made.
>>
>> Moral of the story: You can't have too much bandwidth between the server
>> and the clients.
>>
>> Regards,
>> William
>>
>>
>>
>>
>>
>>
>>
>>      
>>> Message: 1
>>> Date: Thu, 13 May 2010 10:24:43 +0200
>>> From: "Mathieu Pelletier"<mpelletier at tcz.co.zw>
>>> To: k12osn at redhat.com
>>> Subject: [K12OSN] Clients freezing, server losing network
>>> Message-ID:<4BEBB74B.5060503 at tcz.co.zw>
>>> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>>>
>>> Greetings Everyone,
>>>
>>> I am having a problem with my Fedora 13 server and LTSP clients.  My
>>> server is an AMD Athalon X2 Dual core, with 8 gig memory, 1 terabyte
>>> striped raid array, and two ethernet cards (1 for clients, and 1 for
>>> rest of the network; server is also network dhcp server).  My switches,
>>> unfortunately are only 10/100 until I can upgrade them.  I am running
>>> around 25 clients which all seem to run without issues.  The clients
>>> (p4's with about 128mb memory) are running firefox and openoffice using
>>> ltsp-localapps.  The only exception is that every now and again, the
>>> clients will freeze.  On the server everything appears okay, i.e. not
>>> frozen or under extreme load (the load average is somewhere around 0.42
>>> or so).  However it seems like both network cards (on the server) lose
>>> their connection for about ten minutes.  I cannot ping my other server
>>> or any other computer for that matter.  Even if /etc/init.d/network
>>> restart or ifconfig ethX down/up the cards still do not acquire a
>>> network connection.  After about ten minutes the network returns and the
>>> clients unfreeze.  I was wondering if maybe there is a power manager app
>>> turning off the network cards on the server, but I can't seem to
>>> determine if this is the cause or not.
>>>
>>> Does anyone have any ideas on where I should start looking?  I have run
>>> dmesg | grep error, etc but I cannot see anything that begins to explain
>>> my problem.  Any help would be greatly appreciated.
>>>
>>> ~Cheers!
>>>
>>> ------------------------------------------------------------------------
>>> Mathieu Pelletier
>>> Biblical Studies Department
>>> Theological College of Zimbabwe
>>>
>>> Tel: +263 9 287032/3 Ext: 214
>>> mpelletier at tcz.co.zw<mailto:mpelletier at tcz.co.zw>
>>> www.tczonline.com<http://www.tczonline.com>
>>> Chat Google Talk: mkpelletier Skype: mathieu.pelletier
>>>
>>>
>>> On 05/12/2010 06:00 PM, k12osn-request wrote:
>>>
>>>        
>>>> Send K12OSN mailing list submissions to
>>>> 	k12osn at redhat.com
>>>>
>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>> 	https://www.redhat.com/mailman/listinfo/k12osn
>>>> or, via email, send a message with subject or body 'help' to
>>>> 	k12osn-request at redhat.com
>>>>
>>>> You can reach the person managing the list at
>>>> 	k12osn-owner at redhat.com
>>>>
>>>> When replying, please edit your Subject line so it is more specific
>>>> than "Re: Contents of K12OSN digest..."
>>>>
>>>>
>>>> Today's Topics:
>>>>
>>>>       1. OT: Technology Position Coos Bay Oregon (Joe Burkleo)
>>>>
>>>>
>>>> ----------------------------------------------------------------------
>>>>
>>>> Message: 1
>>>> Date: Tue, 11 May 2010 17:20:56 -0700
>>>> From: "Joe Burkleo"<joeb at scesd.k12.or.us>
>>>> To:<k12osn at redhat.com>
>>>> Subject: [K12OSN] OT: Technology Position Coos Bay Oregon
>>>> Message-ID:<4BE991F7.0F3C.0098.1 at scesd.k12.or.us>
>>>> Content-Type: text/plain; charset=US-ASCII
>>>>
>>>> Sorry about the off topic posting.
>>>>
>>>> We are looking for a Tech at our ESD here on the Southern Oregon Coast.
>>>>
>>>> http://www.scesd.k12.or.us/current%20job%20postings/09-10-25%20Technology%20Technician%20III.pdf
>>>>
>>>> Thanks,
>>>> Joe
>>>>
>>>>
>>>>
>>>>
>>>> ------------------------------
>>>>
>>>> _______________________________________________
>>>> K12OSN mailing list
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>>>> End of K12OSN Digest, Vol 75, Issue 4
>>>> *************************************
>>>>
>>>>
>>>>
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>>>        
>>
>>
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> ------------------------------
>
> Message: 2
> Date: Sat, 15 May 2010 00:03:56 -0500
> From: Almquist Burke<burke at thealmquists.net>
> To: "Support list for open source software in schools."
> 	<k12osn at redhat.com>
> Subject: Re: [K12OSN] Clients freezing
> Message-ID:<C81C3FE3-4CD6-4F9E-8510-B4907E489359 at thealmquists.net>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
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> On May 14, 2010, at 4:24 PM, Mathieu Pelletier wrote:
>    
>>   Anyway, can you confirm that a 10/100 connection on the client
>> should be enough as long as the server is using a gigabit NIC?
>>      
> 100 mbits is just fine on the clients. Back in the old days, you
> could even get by with 10, but then you had some clients running
> telnet apps and much lower screen resolutions and color depths. It's
> that uplink on the switch to the server that really need gigabit
> (some people even trunk two gigabit links together if they have a
> super beefy server and a whole lot of clients)
>
>
>    
>> Thanks again... This is a relief knowing that it is not a problem
>> with my configuration files.  Are there any special configuration
>> tricks I can employ in the interim that might lessen the
>> saturation?  I am already running Firefox and OpenOffice as local
>> apps.
>>      
> The biggest thing to do is to lower the resolution and/or color depth
> on the clients. I'd make sure the client's aren't using more than 16
> bit color first. They if you still need to, you can lower the
> resolution (this works better on CRTs than it does on LCDs since LCDs
> have a "native resolution" that things look best at, whereas CRT
> monitors are a little more graceful at scaling downward (of course
> they use more power too). You should be able to set these settings in
> the lts.conf file, if my memory is correct.
>
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>    
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