Overloaded Networks, was Re: Signed Build for Italy

[John Watlington]

> On May 2, 2008, at 12:24 AM, Bryan Berry wrote:
>> I have an unproven theory that the __LINK-LOCAL__ XMPP traffic  
>> (clique) can
>> disable networking on XO's when you get more than 40 XO's in a small
>> space and using AP's. This is just from anecdotal experience not  
>> serious
>> research.

This is not just an unproven theory, this is pretty much assured.
(There might be some non-standard AP setups that could handle this)

For any number of laptops greater than 20, we recommend that they
be registered with a school (presence) server, so that they don't use
salut (clique).   This is REALLY true when using active antennas, but
still true when using access points.

wad

> On Fri, 2008-05-02 at 07:48 +0545, Bryan Berry wrote:
>>> This, or the laptops will have to remain in English.  I don't think
>>> this
>>> is acceptable for the municipality.  Also, OLPC support for regular
>>> builds
>>> at this time is limited to one new release every 6 months.
>>
>> Sorry to chime in so late, but the Italian team can change the  
>> language
>> in the firmware w/out permanently disabling security.
>>
>> from Forth:
>> OK disable-security
>> [reboots]
>> OK disable-security
>> [reboots]
>> OK change-tag LO it_IT.UTF-8   (whatever the codes are for Italy)
>> OK enable-security
>>
>> w/ these steps you can go back to firmware security and Sugar would
>> default to Italian.
>>> What OLPC means by "not supported" should not be overstated.  Kim  
>>> may
>>> want to correct me on this, but the way I interpret it is: "please
>>> don't
>>> call us if your custom build has problems".  Of course, when one  
>>> finds
>> a
>>> problem that can be reproduced also in Update.1, you can report  
>>> it and
>>> ask it to be fixed in the next release, of course, subject to the
>>> severity
>>> of the problem and the available engineering resources.
>>
>>
>> The other nagging issue w/ using stable releases from OLPC is that  
>> you
>> have to change the Jabber server manually to the local Jabber server.
>> That's a lot of work on several thousand XO's. I have an unproven  
>> theory
>> that the XMPP traffic can disable networking on XO's when you get  
>> more
>> than 40 XO's in a small space and using AP's. This is just from
>> anecdotal not serious research.
>>
>>
>> Bryan
>> Kathmandu
>>
> -- 
> Bryan W. Berry
> Systems Engineer
> OLE Nepal, http://www.olenepal.org
>
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