Bug 273950 – eclipse menu and panels are unresponsive for ~2 seconds with remote X

Bug 273950 - eclipse menu and panels are unresponsive for ~2 seconds with remote X


Summary:	eclipse menu and panels are unresponsive for ~2 seconds with remote X

Status:	NEW

Product:	Platform
Classification:	Eclipse
Component:	SWT
Version:	3.4.1
Hardware:	PC Unix All

Importance:	P3 critical (vote)
Target Milestone:	---
Assigned To:	Bogdan Gheorghe
QA Contact:

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Depends on:
Blocks:
	Show dependency tree

Reported:	2009-04-27 17:58 EDT by N K
Modified:	2009-04-28 15:36 EDT (History)
CC List:	3 users (show)

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Description N K

2009-04-27 17:58:37 EDT

Build ID: 3.4.1

Steps To Reproduce:
1. from a system with any X11 server (boxA) log into a system with X11 client libraries supplied by Xorg 6.x (boxB)
2. from boxB, run `DISPLAY=boxA:0 eclipse`
3. try using the eclipse GUI (menus and panels) from boxA and notice the ~2 seconds latency for access even on a gigabit network

More information:
4. from boxB, send `kill -QUIT <pid>` to the java process to see the threaddump during the time it hangs
5. notice that the "main" thread is always stuck at one of two 2 JNI calls when the gui hangs:
  either (i)
org.eclipse.swt.internal.gtk.OS._gtk_widget_set_tooltip_text(Native Method)
  or (ii)
org.eclipse.swt.internal.gtk.OS._gdk_window_get_origin(Native Method)

The ~2 second hanging behavior ONLY seems to occur with X11 client library Xorg 6.x *and* when DISPLAY != localhost.  It does NOT occur with X11 client library Xorg 5.x *or* when DISPLAY=localhost.

It does NOT matter what the X11 *server* library version is.  I've tried Xorg 5.x, Xorg 6.x, Ming, Cygwin/X.  The problem seems completely related to the version of the X11 *client* library used inside SWT's gtk JNI call.

Comment 1 N K

2009-04-27 18:19:10 EDT

Fyi, wherever I say "Xorg 6.x" I'm referring to the suite of libraries from
xorg 1.6.x (which is what Ubuntu 9.04 ships with).   Wherever I say "Xorg 5.x"
I'm referring to the suite of libraries from xorg 1.5.x (which is what Ubuntu
8.10 ships with).

Comment 2 N K

2009-04-27 18:21:30 EDT

For further illustration, one concrete example that gives the ~2 second latency is have boxA=Windows Vista with Cygwin/X, and boxB=Ubuntu 9.04.   I've tried a matrix of machines, involving 4 X11 libraries on each side (16 configurations in total).

Comment 3 Felipe Heidrich

2009-04-28 15:00:18 EDT

Does the problem only happen for Eclipse? Do other GTK apps work fine ?

Comment 4 N K

2009-04-28 15:36:49 EDT

gtk-demo works fine with DISPLAY != localhost, as well as across all permutations of X11 client and server libraries.  I've also not had any issues with other gtk apps (gtk-chtheme, gaim, etc).