Date: Mon, 14 Apr 2008 21:50:20 -0500 From: Eric van Gyzen <eric@vangyzen.net> To: freebsd-x11@freebsd.org Subject: Xorg 7 uses much more CPU than Xorg 6 Message-ID: <480417EC.5090301@vangyzen.net>
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Immediately after upgrading from Xorg 6 to 7, I noticed that whenever an
xterm is "busy" (e.g. compiling something), the entire desktop is sluggish.
I've noticed this on at least three machines with vastly differing hardware.
To quantify my experience, I created to slices on one i386 machine and
installed two systems:
FreeBSD 6.2 with X.org 6.9
FreeBSD 6.3 with X.org 7.3
I created the initial xorg.conf file with "X -configure" and made trivial
modifications for my mouse and monitor.
Running only twm and some xterms, I compiled the 6.2-RELEASE world on each
system and recorded the CPU time used by the Xorg server:
Xorg 6 7.23 seconds
Xorg 7 17.77 seconds
I also ran "yes" with an 80-character argument and ran top to watch CPU
usage. After top reached a steady state, I recorded the following:
==== Xorg 6 ====
CPU states: 67.3% user, 0.0% nice, 32.7% system, 0.0% interrupt, 0.0% idle
PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND
709 root 1 120 0 5240K 4200K RUN 1:08 61.24% xterm
702 root 1 107 0 54636K 10176K select 0:47 30.77% Xorg
729 root 1 6 0 1260K 616K ttywri 0:04 3.28% yes
==== Xorg 7 ====
CPU states: 25.9% user, 0.0% nice, 74.1% system, 0.0% interrupt, 0.0% idle
PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND
768 root 1 122 0 58408K 13188K RUN 1:13 71.44% Xorg
777 root 1 106 0 5344K 4284K RUN 0:25 24.77% xterm
793 root 1 6 0 1268K 604K ttywri 0:02 0.79% yes
================
Does anyone have any ideas why this is happening? I'll gladly supply my
configurations, but they are all remarkably generic.
Thanks,
Eric
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