Hi, I'm trying to use oprofile to debug a problem with idle virtual machines eating 10% cpu but apparently the debuginfo packages for Centos 6 do not exist and so I cannot get any useful information from the kernel. Is there some way to at least get the kernel-debuginfo from somewhere?
Regards, Dennis
On Fri, Jul 29, 2011 at 08:07:38PM +0200, Dennis Jacobfeuerborn wrote:
Hi, I'm trying to use oprofile to debug a problem with idle virtual machines eating 10% cpu but apparently the debuginfo packages for Centos 6 do not exist and so I cannot get any useful information from the kernel. Is there some way to at least get the kernel-debuginfo from somewhere?
If those VMs are el5 then try adding "divider=10" for their kernels.
-- Pasi
On 07/30/2011 06:37 AM, Pasi Kärkkäinen wrote:
On Fri, Jul 29, 2011 at 08:07:38PM +0200, Dennis Jacobfeuerborn wrote:
Hi, I'm trying to use oprofile to debug a problem with idle virtual machines eating 10% cpu but apparently the debuginfo packages for Centos 6 do not exist and so I cannot get any useful information from the kernel. Is there some way to at least get the kernel-debuginfo from somewhere?
If those VMs are el5 then try adding "divider=10" for their kernels.
It's a Centos6 "minimal" guest on a Centos 6 "Desktop" host so technically this shouldn't be needed but I tried it anyway without effect. I also removed the NIC and tried playing with the APIC/ACPI settings but this doesn't seem to matter either. I filed a bug here:
http://bugs.centos.org/view.php?id=5028
According to toracat he sees this also on RHEL6 and SL6 which has me worried because if this is really a Problem upstream that hasn't been addressed yet then I'm not sure how I can justify using Centos 6 as a virtualization platform. 10% of wasted resources per VM is simply not acceptable when you run more than one guest on a system.
Regards, Dennis
On Sat, Jul 30, 2011 at 01:03:23PM +0200, Dennis Jacobfeuerborn wrote:
On 07/30/2011 06:37 AM, Pasi Kärkkäinen wrote:
On Fri, Jul 29, 2011 at 08:07:38PM +0200, Dennis Jacobfeuerborn wrote:
Hi, I'm trying to use oprofile to debug a problem with idle virtual machines eating 10% cpu but apparently the debuginfo packages for Centos 6 do not exist and so I cannot get any useful information from the kernel. Is there some way to at least get the kernel-debuginfo from somewhere?
If those VMs are el5 then try adding "divider=10" for their kernels.
It's a Centos6 "minimal" guest on a Centos 6 "Desktop" host so technically this shouldn't be needed but I tried it anyway without effect. I also removed the NIC and tried playing with the APIC/ACPI settings but this doesn't seem to matter either. I filed a bug here:
http://bugs.centos.org/view.php?id=5028
According to toracat he sees this also on RHEL6 and SL6 which has me worried because if this is really a Problem upstream that hasn't been addressed yet then I'm not sure how I can justify using Centos 6 as a virtualization platform. 10% of wasted resources per VM is simply not acceptable when you run more than one guest on a system.
Yep.. KVM virtualization is still not there in el6.0.
-- Pasi
On 07/30/2011 01:03 PM, Dennis Jacobfeuerborn wrote:
On 07/30/2011 06:37 AM, Pasi Kärkkäinen wrote:
On Fri, Jul 29, 2011 at 08:07:38PM +0200, Dennis Jacobfeuerborn wrote:
Hi, I'm trying to use oprofile to debug a problem with idle virtual machines eating 10% cpu but apparently the debuginfo packages for Centos 6 do not exist and so I cannot get any useful information from the kernel. Is there some way to at least get the kernel-debuginfo from somewhere?
If those VMs are el5 then try adding "divider=10" for their kernels.
It's a Centos6 "minimal" guest on a Centos 6 "Desktop" host so technically this shouldn't be needed but I tried it anyway without effect. I also removed the NIC and tried playing with the APIC/ACPI settings but this doesn't seem to matter either. I filed a bug here:
http://bugs.centos.org/view.php?id=5028
According to toracat he sees this also on RHEL6 and SL6 which has me worried because if this is really a Problem upstream that hasn't been addressed yet then I'm not sure how I can justify using Centos 6 as a virtualization platform. 10% of wasted resources per VM is simply not acceptable when you run more than one guest on a system.
Just a heads up: The problem is the tablet device. Once you remove that from the guest the CPU usage returns to normal.
Regards, Dennis
-
Dennis Jacobfeuerborn -
Pasi Kärkkäinen