On Fri, 31 Mar, Philippe De Ryck wrote:
> On Thu, 2006-03-30 at 23:19 +0100, N.Pauli wrote:
> > On Thu, 30 Mar, Philippe De Ryck wrote:
> > > On Thu, 2006-03-30 at 11:45 +0100, N.Pauli wrote:
> > > > Dear All,
> > > > 
> > > > All of a sudden my machine has become incredibly slow to boot up and to 
> > > > launch anything - boot up took over 5 minutes and launching an app like 
> > > > Mozilla or OpenOffice can take just as long. All the
> while
> > > the harddisk drive light is burning constantly. It is as if there is some 
> > > process that never completes, takes a long time to time out and restarts 
> > > itself whenever I launch an app. Once I'm in, apps
> seem
> > > to run fairly normally. I've looked at 'top' and can't see any culprit 
> > > there. I had this happen once before and it was solved by making sure 
> > > that nothing was plugged in to a usb port while booting 
> up or
> > > even logging on. The last significant things I have done prior to this 
> > > happening do a normal update and upgrade using Synaptic and install 
> > > Liferea.
> > > > 
> > > > Can anybody give me any clues on where I can start looking to resolve 
> > > > this? The machine is a 1100 Mhz Intel Celeron with 256 Mb RAM so it 
> > > > shouldn't be struggling. I'm running Debian GNU/Linux testing
> > > / unstable and the 2.6.12-1-386 kernel.
> > 
> > > 
> > > Just an idea, but you might look into HDD-trouble. See what "hdparm
> > > -tT /dev/..." says. See what "smartctl -a /dev/..." says (good
> > > explanation can be found here:
> > > http://www.linuxjournal.com/article/6983).
> > > 
> > > Maybe a monitor for disk activity can be useful too (gkrellm for example
> > > shows activity and speed).
> > > 
> > > Good luck
> > > 
> > > Philippe De Ryck
> > > 
> > > 
> > Philippe,
> > 
> > That article on SMART Control was worth the price of admission alone! I'm 
> > going to run the short test over night and see if that brings up anything 
> > because all the other signs are healthy - yet the disk
> hangs for minutes on end at the slightest provocation. I tried to run the 
> short (2 minute) test during the day but gave up after 40 minutes.
> > 
> > Nigel
> > 
> 
> Nigel,
> 
> I found the article very useful too! 
> 
> You say your disk hangs but all the attributes indicate a healthy disk.
> One way to know this for sure is to put your disk in another machine. If
> it works fine, you can exclude the disk. If it still hangs, you probably
> know for sure that the disk (or the content) is screwed.
> 
> I've had some bad experience with an NVIDIA nforce2 chipset (incredibly
> slow) but since you haven't changed anything important on your setup,
> that wouldn't be the case. It might be another component that's failing.
> 
> What does 'hdparm -tT /dev/hda' say? Are the speeds reasonable?

Thanks for the suggestion, Philippe. Here's the output:

**
debianoak:/home/nbp# hdparm -tT /dev/hda

/dev/hda:
 Timing cached reads:   1192 MB in  2.00 seconds = 595.20 MB/sec
 Timing buffered disk reads:    6 MB in  3.24 seconds =   1.85 MB/sec
**

That looks reasonable to me - very fast from the cache and a lot slower when it 
has to be buffered (on the hard drive, presumably). But, what do I know!?

Following up Listrcv's suggestion I had a good look in /var/logs/syslog and it 
looks as if it may be something to do with gconf2 being upgraded. This is from 
my notes:

################################################################################################################
# According to Synaptic's history, at 12:19 on 29/03/06 the following upgrades 
happened:
# gconf2 (2.12.1-9) to 2.12.1-12
# gconf2-common (2.12.1-9) to 2.12.1-12
# These are the lines from syslog that bracket that time.
################################################################################################################

Mar 29 11:34:01 localhost -- MARK --
Mar 29 11:39:01 localhost /USR/SBIN/CRON[7813]: (root) CMD (  [ -d 
/var/lib/php5 ] && find /var/lib/php5/ -type f -cmin 
+$(/usr/lib/php5/maxlifetime) -print0 | xargs -r -0 rm)
Mar 29 11:54:01 localhost -- MARK --
Mar 29 12:09:01 localhost /USR/SBIN/CRON[8549]: (root) CMD (  [ -d 
/var/lib/php5 ] && find /var/lib/php5/ -type f -cmin 
+$(/usr/lib/php5/maxlifetime) -print0 | xargs -r -0 rm)
Mar 29 12:17:01 localhost /USR/SBIN/CRON[8753]: (root) CMD (   run-parts 
--report /etc/cron.hourly)
Mar 29 12:34:01 localhost -- MARK --
Mar 29 12:35:15 localhost gconfd (root-9209): starting (version 2.12.1), pid 
9209 user 'root'
Mar 29 12:35:15 localhost gconfd (root-9209): Resolved address 
"xml:readonly:/etc/gconf/gconf.xml.mandatory" to a read-only configuration 
source at position 0
Mar 29 12:35:15 localhost gconfd (root-9209): Resolved address 
"xml:readwrite:/root/.gconf" to a writable configuration source at position 1
Mar 29 12:35:15 localhost gconfd (root-9209): Resolved address 
"xml:readonly:/etc/gconf/gconf.xml.defaults" to a read-only configuration 
source at position 2
Mar 29 12:35:15 localhost gconfd (root-9209): Resolved address 
"xml:readonly:/var/lib/gconf/debian.defaults" to a read-only configuration 
source at position 3
Mar 29 12:35:15 localhost gconfd (root-9209): Resolved address 
"xml:readonly:/var/lib/gconf/defaults" to a read-only configuration source at 
position 4
Mar 29 12:35:45 localhost gconfd (root-9209): GConf server is not in use, 
shutting down.
Mar 29 12:35:45 localhost gconfd (root-9209): Exiting
Mar 29 12:37:28 localhost init: Trying to re-exec init
Mar 29 12:37:39 localhost init: Trying to re-exec init
Mar 29 12:37:57 localhost gconfd (root-9935): starting (version 2.12.1), pid 
9935 user 'root'
Mar 29 12:37:57 localhost gconfd (root-9935): Resolved address 
"xml:readonly:/etc/gconf/gconf.xml.mandatory" to a read-only configuration 
source at position 0
Mar 29 12:37:57 localhost gconfd (root-9935): Resolved address 
"xml:readwrite:/root/.gconf" to a writable configuration source at position 1
Mar 29 12:37:57 localhost gconfd (root-9935): Resolved address 
"xml:readonly:/etc/gconf/gconf.xml.defaults" to a read-only configuration 
source at position 2
Mar 29 12:37:57 localhost gconfd (root-9935): Resolved address 
"xml:readonly:/var/lib/gconf/debian.defaults" to a read-only configuration 
source at position 3
Mar 29 12:37:57 localhost gconfd (root-9935): Resolved address 
"xml:readonly:/var/lib/gconf/defaults" to a read-only configuration source at 
position 4
Mar 29 12:38:27 localhost gconfd (root-9935): GConf server is not in use, 
shutting down.
Mar 29 12:38:27 localhost gconfd (root-9935): Exiting
#
#
# Carried on in this vein FOR OVER AN HOUR AND A HALF till...
#
#
Mar 29 14:09:41 localhost gconfd (nbp-16076): GConf server is not in use, 
shutting down.
Mar 29 14:09:42 localhost gconfd (nbp-16076): Exiting
Mar 29 14:09:46 localhost gconfd (nbp-16156): starting (version 2.12.1), pid 
16156 user 'nbp'
Mar 29 14:09:46 localhost gconfd (nbp-16156): Resolved address 
"xml:readonly:/etc/gconf/gconf.xml.mandatory" to a read-only configuration 
source at position 0
Mar 29 14:09:46 localhost gconfd (nbp-16156): Resolved address 
"xml:readwrite:/home/nbp/.gconf" to a writable configuration source at position 
1
Mar 29 14:09:46 localhost gconfd (nbp-16156): Resolved address 
"xml:readonly:/etc/gconf/gconf.xml.defaults" to a read-only configuration 
source at position 2
Mar 29 14:09:46 localhost gconfd (nbp-16156): Resolved address 
"xml:readonly:/var/lib/gconf/debian.defaults" to a read-only configuration 
source at position 3
Mar 29 14:09:46 localhost gconfd (nbp-16156): Resolved address 
"xml:readonly:/var/lib/gconf/defaults" to a read-only configuration source at 
position 4
Mar 29 14:09:53 localhost gconfd (nbp-16156): Resolved address 
"xml:readwrite:/home/nbp/.gconf" to a writable configuration source at position 0

##################################################
# End of extract from syslog
#################################################
It was after that upgrade that my slowness problems started and gconf began to 
feature so heavily in syslog.

There seems to be a repeating pattern of resolving an address to do with gconfd 
first for user root and then user nbp - and making a real meal of it.

Any ideas anyone? I'm going to try and find out more about what gconf does.

Nigel

-- 
Nigel Pauli
Network Manager
St. John's School, Northwood






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