Bug 70445

Summary:	Corrupt cd-rom data transfers
Product:	[Retired] Red Hat Linux	Reporter:	Vaclav "sHINOBI" Misek <misek>
Component:	kernel	Assignee:	Arjan van de Ven <arjanv>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	high	Docs Contact:
Priority:	medium
Version:	7.3
Target Milestone:	---
Target Release:	---
Hardware:	athlon
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2002-08-02 09:26:48 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 Vaclav "sHINOBI" Misek 2002-08-01 14:27:38 UTC

From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows 98; T312461)

Description of problem:
I have corrupted data transfers from my cd-rom/cdrw

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


How reproducible:
Sometimes

Steps to Reproduce:
1.Copy any larger file from cdrom/cdrw drive
2.Unpack or check MD5-sum
3.
	

Actual Results:  The file is copied without any error messages, but during 
unpacking or installing there are errors (rpm checksum etc.). I found, that 
after enabling DMA for cdrom, this problem disappears. This bug appeared with 
version 7.3.

Additional info:

1. Comp Athlon 1800+, 256 MB DDR RAM, ABIT KR7, Cyberhome DVD drive
2. Comp Athlon 1700+, 256 MB DDR RAM, Soltek SL-75DRV4, NEC CDRW

Comment 1 Arjan van de Ven 2002-08-01 14:30:31 UTC

do you know if dma is enabled for the cdrom drive?

Comment 2 Vaclav "sHINOBI" Misek 2002-08-02 09:26:44 UTC

In default it is disabled from 7.3 and in /etc/proc/ide/hdc/settings is 0 in 
DMA collumn. After enabling DMA the transfers are without corruptions 
(through /etc/sysconfig/harddiskhdc). As I wrote the same think happened with 
different board and drive. I had already problems with verifying Redhat install 
CD`s. The checksum was sometimes OK, but sometimes not. With DMA enabled, 
checksums were OK everytime.

Comment 3 Vaclav "sHINOBI" Misek 2002-08-26 11:27:54 UTC

Seems to be fixed in latest kernels 2.4.18-5 and 2.4.18-10. Thanks.