buildworld releng7 exterme performance loss

Frank Staals frankstaals at
Fri Feb 1 11:26:51 PST 2008

Every 2 weeks or so I rebuild my sources on my laptop ( Dell Latitude 
D630 ). Last wednesday I wanted to update my system again since it was 
allready a couple of weeks ago I rebuilded my sources. There were no 
abnormalities during the build/install. But when I restarted my system 
the system performance was absolutely *horrible*. When I try typing 
anything in a terminal window the lag is about 20 seconds before the 
command even shows up. Switching ttys takes at least as long. When 
logging in remotely the performance is better; giving a random command 
through the ssh session sometimes even allows a command run on a 
local-console to run/finish ( or at least thats what the screen shows ).

Even trying to shutdown the system using shutdown -p now doesn't have 
any effect: I get the message "System is going down NOW" but nothing 
realy happens, I just get my prompt back and I can continue entering 
commands. When I push the power-off button the system actually starts 
shutting down but it stops at "Writing entropy file ."  leaving my only 
choise to power off the system the hard way. When booting the system to 
single-user mode however it reacts normally and also shutting down works 
as it should

Last 2 days I tried redownloading the sources from a different mirror ( instead of ) to rule out 
outdated/corrupted sources. But I still get the same  behaviour. Gladly 
I still had my previous sources so I managed to restore my system in a 
working state. Those sources are from about 3 weeks ago. Does anyone 
know what could have caused this behaviour and how to fix it ? Below is 
some system information, however I'm not sure what I should provide to 
help out, if I should test something I'll gladly do.

Working system (sources from about 3 weeks ago, rebuilded today  ) :

frank at Rena# uname -a
Feb  1 20:23:11 CET 2008     root@:/usr/obj/usr/src/sys/RENAKERNEL  i386


With today's  ( 1 frebruary 2008 ) sources  :

frank at Rena# cat /root/uname
FreeBSD  7.0-PRERELEASE FreeBSD 7.0-PRERELEASE #0: Fri Feb  1 18:32:59 
CET 2008     frank at  i386


Kernel config used for both the builds :

-Frank Staals

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