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тАО03-22-2006 04:20 AM
тАО03-22-2006 04:20 AM
I'm booting with ide0=noprobe ide1=noprobe in order to make use of the ata_piix driver (otherwise PATA mode is used).
There is currently _nothing_ running on this system and the weird thing is, the system load never reaches 0.00! It's almost always around 0.10 or 0.22 and for the life of me I cannot figure out what is bumping the load up.
Now, maybe this is not something to be concerned about, but on my DL140G1 systems I have never encountered this. Of course these were systems using old ATA drives, but the idle load on 'em was always 0.00.
On the new G2 boxes, while I am using the system, there is also occasional IO pauses where I'll enter in a simple command like 'uptime' and the system pauses to think for a good 5 seconds then spits back the answer.
It all adds up to me worrying that this issue will mangify itself once the machine is in production.
Things I have tried:
- Booting in non-SMP mode (HT on in BIOS)
- Booting in SMP mode with noapic (HT on in BIOS)
- Booting in non-SMP mode (HT off in BIOS)
- Booting in SMP mode (HT off in BIOS)
Nothing has fixed the issue.
I've also disabled USB on the system as it appeared to be on the same IRQ as eth0. I am using the HP bcm5700 drivers and this is with the stock RHEL 2.6.9-34 kernel.
Any suggestions? Should I build my own kernel and disable APIC/HT support there?
Also wondering if perhaps the combo of SW RAID and the SATA drivers are causing the issue, but I don't know how to track this down.
Solved! Go to Solution.
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тАО03-22-2006 05:31 AM
тАО03-22-2006 05:31 AM
Re: DL140G2 + RHEL4 + SW RAID = system load never 0?
SATA could be conributing to the issue, but there really isn't an issue.
I've installed RHEL4 on the system using software RAID1 (mirroring).
If there is any activity on the system, even log entries going on, there is going to be work to keep the software mirror updated..
You should consider using hardware raid instead, it takes the activity off the CPU leaving it free for more meaningful work.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО03-22-2006 06:42 AM
тАО03-22-2006 06:42 AM
Re: DL140G2 + RHEL4 + SW RAID = system load never 0?
In any case, I'm not going to worry about it too much. Will see how it behaves once it's out in production.
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тАО03-22-2006 04:37 PM
тАО03-22-2006 04:37 PM
Re: DL140G2 + RHEL4 + SW RAID = system load never 0?
If I switch back however, the symptoms return.
Guess I'll try using my .config from the .16 kernel on the RH kernel and see if that does the trick.
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тАО03-23-2006 03:27 AM
тАО03-23-2006 03:27 AM
Re: DL140G2 + RHEL4 + SW RAID = system load never 0?
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тАО03-23-2006 03:34 AM
тАО03-23-2006 03:34 AM
Re: DL140G2 + RHEL4 + SW RAID = system load never 0?
There is no way this server should be sitting at 0.25-0.30 load when it's running nothing but sshd and the normal OS processes all night.
[rayvd@backup rayvd]$ uptime
08:32:43 up 51 days, 20:46, 3 users, load average: 0.00, 0.00, 0.00
This server has a "slower" processor than mY DL140 but is idle most of the day just as my new server is.
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тАО03-23-2006 08:57 AM
тАО03-23-2006 08:57 AM
Re: DL140G2 + RHEL4 + SW RAID = system load never 0?
I have production email servers that usually stay lower than 0.35, whilst under constant load!
Anyway.. ;)
Figured out which kernel-config options are causing it?
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тАО03-23-2006 09:29 AM
тАО03-23-2006 09:29 AM
SolutionAnyway, I've just installed a max rhel4u3 config on a max-configured rx2620. I'm accessing it through the MP, so it is as hands-off and no load as I can make it without actually turning stuff off.
In multiuser mode, here's what I've got:
[root@max ~]# uptime
17:18:37 up 1 min, 1 user, load average: 0.49, 0.23, 0.09
top - 17:18:51 up 2 min, 1 user, load average: 0.38, 0.22, 0.08
Tasks: 77 total, 1 running, 76 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0% us, 0.0% sy, 0.0% ni, 100.0% id, 0.0% wa, 0.0% hi, 0.0% s
Mem: 16641696k total, 417760k used, 16223936k free, 25152k buffers
Swap: 2031584k total, 0k used, 2031584k free, 102816k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3430 root 16 0 4192 2368 1840 R 0.1 0.0 0:00.01 top
1 root 16 0 3440 1536 1232 S 0.0 0.0 0:02.62 init
2 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
3 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
4 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/1
5 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/1
[root@max ~]# ps -eo "%C %c"
%CPU COMMAND
0.4 init
0.0 migration/0
0.0 ksoftirqd/0
0.0 migration/1
0.0 ksoftirqd/1
0.0 migration/2
0.0 ksoftirqd/2
0.0 migration/3
0.0 ksoftirqd/3
0.0 events/0
0.0 events/1
0.0 events/2
0.0 events/3
0.0 khelper
0.0 kacpid
0.0 kblockd/0
0.0 kblockd/1
0.0 kblockd/2
0.0 kblockd/3
0.0 khubd
0.0 pdflush
0.0 pdflush
0.0 aio/0
0.0 kswapd0
0.0 aio/1
0.0 aio/2
0.0 aio/3
0.0 kseriod
0.0 scsi_eh_0
0.0 qla2400_0_dpc
0.0 scsi_eh_1
0.0 qla2400_1_dpc
0.0 scsi_eh_2
0.0 scsi_eh_3
0.0 kmirrord
0.0 kmir_mon
0.0 kjournald
0.0 udevd
0.0 kauditd
0.0 kmpathd/0
0.0 kmpathd/1
0.0 kmpathd/2
0.0 kmpathd/3
0.0 dhclient
0.0 syslogd
0.0 klogd
0.0 portmap
0.0 rpc.statd
0.0 rpc.idmapd
0.0 smartd
0.0 acpid
0.0 cupsd
0.0 sshd
0.0 xinetd
0.0 sendmail
0.0 sendmail
0.0 gpm
0.0 htt
0.0 htt_server
0.2 cannaserver
0.0 crond
0.0 xfs
0.0 anacron
0.0 atd
0.0 salinfod
0.0 dbus-daemon-1
0.0 cups-config-dae
0.0 hald
0.0 login
0.0 mingetty
0.0 mingetty
0.0 mingetty
0.0 mingetty
0.0 mingetty
0.0 mingetty
0.0 bash
0.0 ps
If I wanted to improve my load factors, there's a bunch of stuff I could shut down there. I suspect it is the same for the OP.
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тАО03-23-2006 09:38 AM
тАО03-23-2006 09:38 AM
Re: DL140G2 + RHEL4 + SW RAID = system load never 0?
In any case, it seems that disabling APIC in the kernel and also disabling SMP support (I have a uniprocessor system anyways).
The only side effect of this is that /proc/interrupts shows ERR: incrementing a _lot_, but the system load numbers are more what I'd expect and the IO "pauses" are much less frequent.
I'll probably try this on a system without software RAID and see if the md driver is to blame or if it's ata_piix.
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тАО03-23-2006 10:00 AM
тАО03-23-2006 10:00 AM
Re: DL140G2 + RHEL4 + SW RAID = system load never 0?
Part of the standard proliant install process involves a kernel change if you have a fiber connection.
If you'd care to share the customizations and changes, it would make this a valuable historical thread.
You have relatively few posts so I'll ask you to assign points to responses based on usefulness. If you found my advice useless, please take the time for posting me zero points.
TY
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com