Bug 25310

Summary:	magicdev wastes CPU cycles
Product:	[Retired] Red Hat Linux	Reporter:	josip
Component:	magicdev	Assignee:	David Mason <dcm>
Status:	CLOSED NOTABUG	QA Contact:	David Lawrence <dkl>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.0	CC:	gunther.mayer
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2001-01-30 16:56:18 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description josip 2001-01-30 16:56:15 UTC

magicdev-0.2.7-5 takes too much CPU time (typically 18 percent) without any
device activity.  This happens on a dual CPU machine with two (idle, empty)
CD-ROM drives (on hdc and hdd), one of which is attached via ide-scsi
driver.  This 18 percent load is excessive, something under 5 percent would
be more acceptable, and less than 1 percent would be ideal.

Comment 1 Elliot Lee 2001-02-01 21:26:33 UTC

magicdev periodically checks the devices for new media. The indicated CPU load
is primarily a function of hardware - e.g. IDE will consume more CPU time than
SCSI.

There's really nothing that can be done on the magicdev end to reduce the
indicated CPU load, but you can take consolation in the ability to turn magicdev
off if it is causing real problems, and ignore it if it is not.

Comment 2 Gunther Mayer 2006-02-20 14:53:13 UTC

The root-cause might be related to
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=179573,
but there is not enough data above to be sure.