[K12OSN] Clients freezing

Fri May 14 21:24:03 UTC 2010

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:
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>     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
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>>> 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
>>>
>>>
>>>
>>>
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