Bug 366191 - abnormal CPU usage on idle state for kernel
abnormal CPU usage on idle state for kernel
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
i686 Linux
low Severity medium
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Assigned To: Dave Jones
Fedora Extras Quality Assurance
Depends On:
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Reported: 2007-11-04 17:12 EST by marco bernardi
Modified: 2015-01-04 17:29 EST (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2008-06-16 22:48:34 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description marco bernardi 2007-11-04 17:12:24 EST
Description of problem:

nanosleep() do not have same behaviour like in prvios Fedora and other Linux
distribution. Result is that idle state cretae an abnormal CPU usage.
That happens updating to Kernel it was not just after Fedora
7 installation.

Version-Release number of selected component (if applicable):

How reproducible:
I am using xHarbour compiler. In such compiler, nanosleep(..) is set like follow

static struct timespec nanosecs = { 0, 1000 };
nanosleep( &nanosecs, NULL );

Compiler creates binary that during idle state (waiting keyboard/mouse event)
show a CPU usage (top) of 0/0.2 %
After upgrading to kernel version, the CPU usage became 89%,
keyboard sometimes looses characters, mouse sometimes looses "click"

I can obtain the same original behavior changing setting as follow  
static struct timespec nanosecs = { 0, 10000000 };
nanosleep( &nanosecs, NULL );

Steps to Reproduce:
Actual results:
abnormal usage of CPU during idle status (89 %), problem for keybourd,mouse input

Expected results:
normal CPU usage (like before kernel update and on others Linux distribution)
(0/0.2 %), normal behavior of keyboard and mouse

Additional info:
Comment 1 marco bernardi 2007-11-15 15:13:53 EST
version continue to have same bug

Regards, Marco
Comment 2 David Nielsen 2008-01-26 22:44:37 EST
This doesn't sound like an ndesk-dbus problem, reassigning to kernel component
and blaming davej.
Comment 3 Bug Zapper 2008-05-14 10:59:19 EDT
This message is a reminder that Fedora 7 is nearing the end of life. Approximately 30 (thirty) days from now Fedora will stop maintaining and issuing updates for Fedora 7. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '7'.

Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 7's end of life.

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Comment 4 Bug Zapper 2008-06-16 22:48:32 EDT
Fedora 7 changed to end-of-life (EOL) status on June 13, 2008. 
Fedora 7 is no longer maintained, which means that it will not 
receive any further security or bug fix updates. As a result we 
are closing this bug. 

If you can reproduce this bug against a currently maintained version 
of Fedora please feel free to reopen this bug against that version.

Thank you for reporting this bug and we are sorry it could not be fixed.

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