Bug 439584

Summary:	Enabling DMA & boosting the data transfer.
Product:	Red Hat Enterprise Linux 5	Reporter:	Parag Kalra <paragkalra>
Component:	kernel	Assignee:	David Milburn <dmilburn>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	low
Version:	5.1	CC:	dmilburn
Target Milestone:	rc
Target Release:	---
Hardware:	i386
OS:	Linux
URL:	http://discoverlinux.blogspot.com
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-05-25 22:35:28 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 Parag Kalra 2008-03-29 10:29:27 UTC

Description of problem:
Enabling DMA & boosting the data transfer.

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


How reproducible:
Everytime

Steps to Reproduce:

I have HP 7400 DX Tower. I have installed two Operating Systems on it:
1.] SLES 10 SP1
2.] RHEL 5.1

SLES has recognized the hard-disk as /dev/sda where as RHEL has recognized it as
/dev/hda which means that RHEL has not enabled the DMA. How can I enable DMA?
Also copying chunk of data on RHEL is taking years where as in SLES it is
getting copied like a charm. Thus SLES has found a S-ATA drive, and RHEL thinks
it's P-ATA. 

  
Actual results:
On RHEL 500 MB data is taking 5 min to get copied locally where as on SLES it
takes less than 50 secs.

Expected results:
It should recognize the hardisk as SATA and data transfer should be fast. I
think it's a driver issue. Do we have a patch or a workaround?


Additional info:

Comment 2 David Milburn 2010-05-12 18:16:49 UTC

Please test a more recent RHEL5 kernel:

http://people.redhat.com/jwilson/el5/

If this is still a problem, please attach the output of dmesg after boot, and
the output of lspci.

Comment 3 David Milburn 2010-05-25 22:35:28 UTC

Closing, please re-open if necessary.