SSH Compression

[Jeff]

Update:

So far, with only a few clients on the network, I can't tell how much  
difference there really is, but subjectively it seems much (much!)  
faster with compression enabled. Apps like Libre Office, when  
minimized and maximized, feel pretty much like working on the server.

Can anyone else please check this? It seems a worthwhile exercise to  
me. Why is it not enabled by default?

On 29 Aug 2011, at 12:10 PM, Jeff wrote:

> Thanks for the input, David.
>
> Still getting my head around *NX. Can the client work from the thin- 
> clients without loading a windowing system?
>
> In the meantime, I found this article http://ubuntuforums.org/archive/index.php/t-368869.html 
>  about compression.
>
> Looking around the configuration files I don't see any compression  
> enabled in /var/lib/tftpboot/ltsp/i386/lts.conf so I've added:
>
> ## SSH compression between LTSP client and server
> NETWORK_COMPRESSION = True
>
> remotely, but haven't been onsite to test it yet.
>
> /var/lib/tftpboot/ltsp/i386/config-2.6.38-8-generic has several  
> compression parameters, but nothing explicitly about SSH from what I  
> can see.
>
> Will post an update when I've had a chance to test.
>
> Cheers,
>
> Jeff
>
>
>
>
> On 24 Aug 2011, at 3:24 PM, David Groos wrote:
>
>> Hey Jeff, Sounds like you are looking for good gui remote access  
>> over ssh? I use FreeNX as the server and use NoMachine's client and  
>> now also use OpenNX since it works well with lion-10.7.  The access  
>> over broadband internet is just like sitting at the computer--works  
>> great to manage remote servers running Edubuntu/ltsp.  I hear it is  
>> even a decent experience over dial-up.  So, while I don't know what  
>> the compression is, it must be pretty good to work this well in  
>> this situation.  If you have more questions, let me know.
>> David
>>
>> On Wed, Aug 24, 2011 at 7:15 AM, Jeff <jeff at wildcoast.com> wrote:
>> Hi all,
>>
>> I don't have easy access to a server at the minute, and not sure  
>> where the settings are anyway; but I've been wondering about this  
>> for a while and am just hoping that someone can point me in the  
>> right direction:
>>
>> A week or so ago when I was onsite at a school, I ran a binary  
>> tcpdump to get an indication of network usage with approximately 12  
>> thin clients working.
>>
>> It wasn't a very precisely measured test or anything, but the  
>> server sent/received a Gigabyte of traffic in about a couple of  
>> minutes.
>>
>> So I'm just wondering whether SSH compression is enabled by default  
>> or not? And if it is, whether there's any way to tweak it?
>>
>> Also, it occurs to me that SSH compression would have to be  
>> lossless, by nature. So I'm wondering if there's any way to get  
>> something like tight-vnc working; or whether we should try a  
>> lightweight X desktop like XFCE?
>>
>> I'm not really happy about the performance, compared to terminal  
>> server, for ex, or even the old Fedora/Gnome K12-LTSP we upgraded  
>> from.
>>
>> Insights and pointers appreciated. Flames > /dev/null
>>
>> ;-)
>>
>> --
>> Jeff Brown
>>
>> Tel:+27-74-101 5170
>> Fax:+27-86-532 3508
>> www.wildcoast.co.za
>>
>>
>
> -- 
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--
Jeff Brown

Tel:+27-74-101 5170
Fax:+27-86-532 3508
www.wildcoast.co.za



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