buildworld releng7 exterme performance loss

[doug at safeport.com]

On Wed, 6 Feb 2008, Jerry McAllister wrote:

> On Wed, Feb 06, 2008 at 08:22:16PM +0100, Frank Staals wrote:
>
>> Frank Staals wrote:
>>> 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
>>> ( cvsup2.freebsd.org instead of cvsup.nl.freebsd.org ) 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 outdated/corrupted sources.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.
>
> Sounds like the system is spending a lot of time waiting for some
> resource - I don't know which one[s].
>
> Have you perused the system logs?   Can you be running out of memory
> or swap space?  Is the system built with debugging turned on?
>
> I'm not sure what else to suggest.

if you have not already done so turn on all.log (see etc/syslog.conf)

> ////jerry
>
>
>>>
>>> Working system (sources from about 3 weeks ago, rebuilded today  ) :
>>>
>>> frank at Rena# uname -a
>>> FreeBSD Rena.FStaals.net 7.0-PRERELEASE FreeBSD 7.0-PRERELEASE #0: Fri
>>> Feb  1 20:23:11 CET 2008     root@:/usr/obj/usr/src/sys/RENAKERNEL  i386
>>>
>>> dmesg: http://fstaals.net/junk/rena/dmesg_old.txt
>>>
>>> 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 Rena.FStaals.net:/usr/obj/usr/src/sys/RENAKERNEL  i386
>>>
>>> dmesg: http://fstaals.net/junk/rena/dmesg_2008_01_02.txt
>>>
>>> Kernel config used for both the builds :
>>>
>>> http://fstaals.net/junk/RENAKERNEL.txt
>>>
>> Updated my sources again today. This time even build with a GENERIC
>> kernel but still the same result. Is there nobody who can help me with
>> this ?
>>
>> --
>> -Frank Staals

if you have not already done so turn on all.log (see etc/syslog.conf)