Login or Register to Ask a Question and Join Our Community


Red Hat

What would cause high kernel/system utilisation

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Operating Systems Linux Red Hat What would cause high kernel/system utilisation
# 1  
Old 08-11-2008
What would cause high kernel/system utilisation
We have a VM running RedHat that seems to have very high system (kernel) utilisation compared to our physical servers running the same OS and workload that show normal system time utilisation.

Any ideas?

Thanks in advance.
# 2  
Old 08-12-2008
what virtual manchine software ?
and how you measure the cpu usage?

i have seen some virtualization software report some weird things to the emulated kernel, so the emulated kernel wuld try to make the maths to get a percentage of cpu used and fail
# 3  
Old 08-12-2008
Hi broli thanks for the pointer. We are using ESX 3.5 with the linux VM running RedHat 4 kernel (due to the app requirements).
We have just upped the VM to have 4 vCPUs to match the physical cousins and this has made things better, the run queue is lighter (as you would expect) and the %system is lower but still a bit higher than expected copmpared to the physical boxes.
VMware Tools is installed as well.
We are measuring the CPU usage with the usual suspects top/sar/vmstat/mpstat.
The VM is not waiting on any I/O either.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Linux

Reason/components behind high memory utilisation on linux

Hi friends, Problem: High memory utilisation of one linux server, due to which a database crashed on the server. My question to all: How does glance calculate that memory utilisation on the linux server is 98%. I mean what components are part of (31.4gb-599mb)? How can i check that myself? Can... (3 Replies)
Discussion started by: kunwar
3 Replies

2. Shell Programming and Scripting

what would a script include to find CPU's %system time high and user time high?

Hi , I am trying to :wall: my head while scripting ..I am really new to this stuff , never did it before :( . how to find cpu's system high time and user time high in a script?? thanks , help would be appreciated ! :) (9 Replies)
Discussion started by: sushwey
9 Replies

3. UNIX for Advanced & Expert Users

Kernel usage is high

Hi all, I have a solaris box, and I would like to know if anyone has commands to check kernel usage's. Scenario: solaris box is having cpu 100 % issue. . I have used sar -u 10 5 it shows 35 % kernel usage. If you can guide with some docs that would be good.. waiting for... (1 Reply)
Discussion started by: SunSolars_admin
1 Replies

4. UNIX for Dummies Questions & Answers

Kernel/ user space and high/ low mem

Need some clarification on this.... 1. how are kernel/ user spaces and high/low memory related? 2. What do they all mean when i have the kernel command line as: "console=ttyS0,115200 root=/dev/sda2 rw mem=exactmap memmap=1M@0 memmap=96M@1M irqpoll" or 2. what do mem and memmap mean in... (3 Replies)
Discussion started by: dragonpoint
3 Replies

5. Solaris

Which file is read by kernel to set its default system kernel parameters values?

Hi gurus Could anybody tell me which file is read by kernel to set its default system kernal parameters values in solaris. Here I am not taking about /etc/system file which is used to load kernal modules or to change any default system kernal parameter value Is it /dev/kmem file or something... (1 Reply)
Discussion started by: girish.batra
1 Replies

6. UNIX for Advanced & Expert Users

Extremely high kernel CPU Usage (Solaris 10 SPARC)

I've got a domain running on a few boards of a 25k. I'm seeing very high kernel cpu usage in top and cant' quite explain it. System runs a large number of smallish Oracle 10g2 databases (30), used mainly for development. load average: 36.63, 36.68, 37.42 2489 processes: 2452 sleeping, 21... (0 Replies)
Discussion started by: utopiajoe
0 Replies

7. IP Networking

bandwidth utilisation high after implementing firewall

hi, we have one unix server which sends multicast packets in the network, recently we have implemented firewall in between unix server and clients.After implementing firewall we found our lease line utilisation has been increased dramatically. Is this because of firewall or else...please... (2 Replies)
Discussion started by: ajaysahoo
2 Replies

8. Linux

High Mem & Cpu Utilisation

Hi All, Kindly help me in optimizing the server as it displays a great amount of CPU & MEM being utilised when the mysql process executes. Below are the stats --- -------------------------------------------------------------------------- # top 15:51:57 up 23:22, 5 users, load average:... (1 Reply)
Discussion started by: gautamatul82
1 Replies

9. UNIX for Advanced & Expert Users

Sun: High kernel usage & very high load averages

Hi, I am seeing very high kernel usage and very high load averages on my system (Although we are not loading much data to our database). Here is the output of top...does anyone know what i should be looking at? Thanks, Lorraine last pid: 13144; load averages: 22.32, 19.81, 16.78 ... (4 Replies)
Discussion started by: lorrainenineill
4 Replies

10. UNIX for Advanced & Expert Users

High kernel usage using sleep

Hi I have a lot of scripts running on a Sun Solaris server, which are constantly running in a loop looking for work to do. When they have no work they sleep for a certain amount of time (60secs normally). I have 13 of these scripts running the number of sleep command issued can be in the order... (4 Replies)
Discussion started by: handak9
4 Replies
Login or Register to Ask a Question