Bill Moran ?????:
In response to Artem Kuchin <mat...@itlegion.ru>:
I have a very strange situation here. There was a hosting box with 5
jails.
Everything is 6.4
It was running twe driver with RAID 5.
Then i had a crash and had to reinstall the system.
So, i have installed FREEBSD 6.8, cvsed the latest, rebuilt everything
and then
just copied jails from the prev installation. So, the host system is 6.8
and the jails are 6.4.
Also, raid is MIRROR now, not RAID5.
OK. I originally thought your subject was a typo, but this is the
second place where you mentioned 6.8.
Not only would you have to go into the future to get 6.8, but you'd
have to slip into an alternate reality, since 6.5 is expected to be
the last release on the 6 branch.
What is the output of uname -a? If you really have something called
6.8, where on earth did you get it?
Apparently i just made it up. I should change the tea i drink or check
the water source.
Of course the new is still 6.4 just updates to the latest sources.
Maybe i got confuses about the version since it is the last server
running version 6 and
i was kind of subconsciously sure that 6.8 must be the last before 7 :)
The problem is that now everything became really slow.
When i do top i see:
load averages: 16.45, 14.86, 13.86
737 processes: 20 running, 703 sleeping, 14 zombie
CPU: 15.9% user, 0.0% nice, 81.9% system, 2.2% interrupt, 0.0% idle
Everything pretty much as it was. But 82% system CPU is really weird. I
don;t remember
exactly, but i think it was not like this before. AFAIK it meas 82% of
CPU time is spent in
the kernel.
gstat output seems to indicate nothing unusual, so the time spent in
the kernel must be for something else, network traffic maybe? Try
checking top with -m io to see if anything is showing an unusually
high # of context switches.
Perhaps do a little easter egg hunting and try shutting down processes
to see what is using up all the system time. Once you've got it
narrowed down you can run ktrace on the problematic process to see
what it's doing.
Well, the trick is it was not so before and i did not change anything.
It is a web hosting server
and host around 100 sites with a lot of perl running.
22533 xxx 1 130 0 21276K 12904K CPU2 2 0:02 62.68% perl5.8.8
22545 xxx 1 116 0 3592K 2992K RUN 3 0:01 51.00% perl
22542 xxx 1 -4 0 5448K 3908K CPU0 0 0:01 43.05% perl
22546 xxx 1 -4 0 3564K 2968K RUN 0 0:01 36.00% perl
22501 xxx 1 4 0 25168K 17148K sbwait 3 0:04 20.84% perl5.8.8
21165 xxx 1 130 0 15168K 12248K RUN 0 0:59 17.29% perl
22556 xxx 1 -4 0 3596K 2900K RUN 0 0:00 15.00% perl5.8.8
18125 xxx 1 113 0 26912K 18908K select 2 0:10 14.94% httpd
22495 xxx 1 4 0 25168K 17152K sbwait 0 0:04 12.50% perl5.8.8
22496 xxx 1 4 0 15056K 13832K sbwait 3 0:04 12.01% perl5.8.8
22502 xxx 1 4 0 8640K 7436K sbwait 1 0:02 11.57% perl5.8.8
It they have been running before and it was a lot faster.
top -m io shows 0.00% for all processes.
The memory is more than enough:
Mem: 3081M Active, 3702M Inact, 339M Wired, 395M Cache, 112M Buf, 511M Free
I tried disabling mysql just for fun. I did not help.
Shutting down process by process is not an option because
1) it is a production server
2) there over 700 processes
trafshow shows average CPS about 400K/sec - not much and as it was before.
So, is there anyway to see what kernel is doing and why system load is
so high?
--
Artem
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