[conspire] Network Latency on LAN

Bill Moseley moseley at hank.org
Tue Jul 31 17:53:40 PDT 2007

Well, I figured out what triggers the latency, and so I can figure
out a work-around.

But, I'm not exactly sure what's happening, and I'd like to
investigate a bit more.

I've been powering up the laptop and then just closing the lid and
letting it set at the gdm login screen.

Seems that when it times out and blanks the screen is when the latency
start.  Screen saver is not starting -- just goes blank (but backlight
is still on).

If I instead log in via gdm and then let it time out (which in that case
does run 3d screen saver with load average up to one) there's
*no* latency over my ssh connections.  It only happens when the gdm
login screen times out.

Running top doesn't show any process eating CPU when the gdm screen
blanks.  Plus, I wouldn't expect that much latency even if there was a
cpu intensive process running.

How do I run xset -q when it's setting at the login prompt?  I want to
try forcing dpms mode and see if I can duplicate.  I tried:

    $ DISPLAY=:0.0 sudo xset -q

But that doesn't work

Once I log via gdm on the laptop in I can run DISPLAY=:0.0 xset -q and
access the settings.

$ ps aux | egrep '[g]dm'
root      5333  0.0  0.0  12216  1400 ?        Ss   16:57   0:00 /usr/sbin/gdm
root      5336  0.0  0.1  12576  2204 ?        S    16:57   0:00 /usr/sbin/gdm
root      5337  0.1  0.5  23536 12404 tty7     SLs+ 16:57   0:03 /usr/X11R6/bin/X :0 -br -audit 0 -auth /var/lib/gdm/:0.Xauth -nolisten tcp vt7
gdm       5595  0.0  1.0  30152 21312 ?        Ss   16:57   0:00 /usr/lib/gdm/gdmgreeter

Bill Moseley
moseley at hank.org

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