Bug 966416

Summary:	grub uses 100% cpu
Product:	[Fedora] Fedora	Reporter:	Jens Petersen <petersen>
Component:	grub2	Assignee:	Peter Jones <pjones>
Status:	CLOSED CANTFIX	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	19	CC:	bcl, bugzilla, dennis, mads, mcrha, pjones
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-06-04 01:26:04 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Jens Petersen 2013-05-23 09:01:09 UTC

Description of problem:
Not sure what it is doing by grub seems to use a lot CPU
when it is running.

Version-Release number of selected component (if applicable):
grub2-2.00

How reproducible:
100%

Steps to Reproduce:
1. start grub and press e to edit menu
2. wait and watch CPU and temperature
3. press Ctrl-x


Actual results:
2. system uses 1 cpu and temperature rises
3. temperature fails again

Expected results:
grub should only need a little CPU.

Additional info:
This is an old bug it has been happening for quite a long time:
I think it often causes my old Thinkpad T500 to not reboot due to overheating.

Comment 1 Mads Kiilerich 2013-05-28 00:00:11 UTC

Grub might be a full OS and kernel but it is not yet as feature complete and sophisticated as linux. Is it reasonable to expect it to include power management?

Comment 2 Jens Petersen 2013-05-28 09:05:56 UTC

I see, so this is expected behavior?

Comment 3 Jens Petersen 2013-05-28 09:10:58 UTC

I could be wrong but I don't think grub1 used 100% cpu.

Comment 4 Chris Murphy 2013-06-02 02:19:16 UTC

On my systems, including VMs, grub legacy and grub2 both fully consume one CPU core. So while I don't like it, I don't see the difference in behavior between the two grubs.

Comment 5 Jens Petersen 2013-06-04 01:26:04 UTC

Okay fair enough - maybe it is something that could be or has been discussed upstream: probably this bug can be closed then. I will try to pass through
grub quickly on my laptop with poor/broken fan to avoid it overheating.

Comment 6 Javier Martinez Canillas 2020-03-19 15:47:14 UTC

*** Bug 1710242 has been marked as a duplicate of this bug. ***