[X2Go-Commits] page changed: doc:faq:start

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Fri Aug 21 03:08:40 CEST 2015


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Date        : 2015/08/21 01:08
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Old Revision: http://wiki.x2go.org/doku.php/doc:faq:start?rev=1440117653
New Revision: http://wiki.x2go.org/doku.php/doc:faq:start
Edit Summary: Add: Why not just use X11 forwarding over SSH? This is what Keith Package recommended.
User        : mikedep333

@@ -22,9 +22,9 @@
  Nowadays the NX libs shipped with X2Go work as a replacement for the NXv3 that are not maintained by NoMachine anymore.
  
  (This FAQ article has been written by Mike Gabriel, if someone does not agree with the given information on NoMachine, please be so kind to contact me, so that we can discuss it and possibly correct errors in the given information).
  
- ==== Why are you using the terms
"nx-libs" and "NX libraries" when X2Go uses the 2 executables nxproxy & nxagent?  ====
+ ==== Why are you using the terms "nx-libs" and "NX libraries"? X2Go clearly uses the 2 executables nxproxy & nxagent?  ====
  
  Basically:
  
    - That is the term that was always used.
@@ -43,8 +43,22 @@
  
  Only the 1st 3 are libraries.
  
  Having separate tarballs made maintenance more difficult, so they were combined into one as the X2Go project started redistributing them.
+ 
+ ==== Why not just use X11 forwarding over SSH? This is what Keith Package recommended. ====
+ 
+ You are probably referring to the [[http://keithp.com/~keithp/talks/lbxpost/|LBX post-mortem]]
+ 
+ It is true that X11 forwarding's performance can be improved by SSH's zlib compression and by the use of XCB rather than xlib.
+ 
+ However, nx-libs performs 3 additional performance improvements:
+ 
+   - nx-libs caches images, so that they do not have to be resent. For example, opening up your "start menu" is very fast
the 2nd and 3rd time that you do so.
+   - zlib is generic lossless compression, so it is not well-suited for images. nx-libs acheives better performance by using compression methods such as JPEG (default, lossy) or PNG (lossless.)
+   - XCB applications are still partially hindered by round-trips, and nx-libs eliminates more of those round-trips. See  [[https://lwn.net/Articles/343506/|Bart Massey's explanation]] for more info.
+ 
+ The 1st 2 performance improvements also reduce bandwidth usage; which has the effect of improving performance when other users are sharing the same WAN link.
  
  ==== What is the difference to LTSP? Why a free thin client environment? ====
  
  LTSP requires a high bandwidth on your network. It can efficiently be used in Local Area Networks (LANs) only. 



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