Discuss March 2006

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274 participants
422 discussions

too much cpu system time with kernel 2.6.9-22.0.2.EL
by David Mansfield 09 Mar '06

09 Mar '06

I'm running a server recently installed with centos 4.2. It's running the kernel in the subject line, on an PIII 866Mhz with 512mb ram. The system is running basically two processes: 1) ssh to remote system, receiving a stream of bytes piped into 2) gzip the stream, write to disk file The system is slow, relatively (866Mhz cpu) and the network is fast (gigabit) so the limiting factor should be CPU. And it is. However, at times, the system gets into a 'weird' state where instead of using about 85% user/ 15% system, it goes to 50% user and 50% system. Now 50% system time for this load is ridiculous, and as I said before, most of the time it is 85/15 and only occasionally get's 'stuck' in 50/50. So I got oprofile running to find out what part of the kernel it is stuck in, and here is the output of opreport -l vmlinux (top scores only): CPU: CPU with timer interrupt, speed 0 MHz (estimated) Profiling through timer interrupt samples % symbol name 21117 36.5340 default_idle 3850 6.6608 __copy_from_user_ll 3108 5.3771 find_get_page 1707 2.9532 __copy_user_intel 1580 2.7335 __might_sleep 1356 2.3460 handle_IRQ_event 1323 2.2889 __copy_to_user_ll 1168 2.0207 __find_get_block_slow 1134 1.9619 __find_get_block 1093 1.8910 finish_task_switch 963 1.6661 bh_lru_install 638 1.1038 __wake_up 605 1.0467 __do_softirq This is CRAZY! How can default_idle be sucking away cycles when the system is (should be) cpubound? Can anyone explain this? David

4 5

multiple DVD-+RW drives?
by Yanik Doucet 09 Mar '06

09 Mar '06

4 5

howto mount a scsi tape drive?
by Geert Batsleer 09 Mar '06

09 Mar '06

Hi, after installing centos 4.2 I've noticed that my internal Seagate scsi DAT 72GB tape drive hasn't been recognised in /media or doesn't show up in gnome when putting in a tape. Do I need to edit fstab first or load additional modules in the kernel during startup? regards, Geert

3 2

comps.xml
by PV Juliet 09 Mar '06

09 Mar '06

I want to modify the comps.xml . I have a package list of minimal nstallation of centos. So I tried to change the comps.xml with respect to that . In my comps file is having only one group "Base" . while installing with this distribution CD , i am getting an error of comps tree structure missing some critical groups. Can anyone can suggest, Thanks in advance Regards juliet

2 3

howto mark bad block with fsck?
by ijez 09 Mar '06

09 Mar '06

Hi, Can anyone point me on howto use fsck to marking the bad block so it won't be use to store a file? I have one hdd with the bad block running on one of my server with this problem. While I rebuild a new server to replace the hdd, I really like to have a temporary solutions for that. Thanks in advances, regards, ijez -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 268.2.0/275 - Release Date: 06/03/2006

3 4

nut rpms for CenOS 4
by Kanwar Ranbir Sandhu 08 Mar '06

08 Mar '06

Hello Everyone, Does anyone know where to grab RPMs for nut? Or, at the very least, a spec file that could be used to build a new one for CentOS 4? I'd much rather use apcupsd, but the UPS in question is only supported via nut. Regards, Ranbir -- Kanwar Ranbir Sandhu Linux 2.6.15-1.1831_FC4 i686 GNU/Linux 16:26:44 up 9:56, 3 users, load average: 1.66, 0.92, 0.68

3 5

Process run away
by Mace Eliason 08 Mar '06

08 Mar '06

Hi, I just found that one of my centos servers was running at 100% cpu and had used up all the memory. I checked system monitor and was not able to find the culprit, I restarted the server and it seems fine now. Does anyone know of a simple way to have the server email me if the cpu load is at max for x amount of time. I am not sure how long it was running like that, I have not checked it for a while. What would you recommend for something like this Thanks Mace

2 1

TinyCA2 on Centos
by Robert Moskowitz 08 Mar '06

08 Mar '06

http://tinyca.sm-zone.net/ has the following: "RPM for SuSE Linux 9.3 : <http://tinyca.sm-zone.net/tinyca2-0.7.2-0.noarch.rpm>tinyca2-0.7.2-0.noarch.rpm (Should work with the most current distributions) " Will this RPM work on Centos 4.2?

3 7

AMD x2 and make
by Jerry Geis 08 Mar '06

08 Mar '06

Is there a special command or anything to get a "make" process take advantage of SMP with the AMD x2. I mean when I type make is it dispatching 2 compiles at a time? How do know it is or how do I tell it to take full advantage of the DUAL processor. Thanks, jerry

3 2

system-config-bind?
by Benjamin J. Weiss 08 Mar '06

08 Mar '06

I'm trying to move our bind-8 from a redhat 9 box to a bind-9 on a CentOS-4 box. I'm not as good as I'd like to be in bind, so I thought I'd use the configuration tool. But I can't find it! I've tried yum search system-config-bind, googling, everything I can think of. Is the tool just plain gone? Thanks! Ben

4 6

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Discuss March 2006