Bug 67539
Summary: | /proc/ide/piix does not display correct DMA mode | ||||||||
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Product: | [Retired] Red Hat Linux | Reporter: | Roderick Constance <rconstance> | ||||||
Component: | kernel | Assignee: | Arjan van de Ven <arjanv> | ||||||
Status: | CLOSED CURRENTRELEASE | QA Contact: | Brian Brock <bbrock> | ||||||
Severity: | medium | Docs Contact: | |||||||
Priority: | medium | ||||||||
Version: | 7.3 | ||||||||
Target Milestone: | --- | ||||||||
Target Release: | --- | ||||||||
Hardware: | i686 | ||||||||
OS: | Linux | ||||||||
Whiteboard: | |||||||||
Fixed In Version: | Doc Type: | Bug Fix | |||||||
Doc Text: | Story Points: | --- | |||||||
Clone Of: | Environment: | ||||||||
Last Closed: | 2004-09-30 15:39:42 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: | |||||||||
Attachments: |
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Created attachment 62784 [details]
steps to reproduce
I've also been experiencing a performance hit when reverting back to udma5 mode. Starting in udma5 mode will produce expected performance. Changing to a slower udma setting will produce expectedly slower performance. But when changing back to udma5, the performance is as slow as the sub-udma5 tests. Created attachment 66684 [details]
steps to reproduce: reversion to udma5 performance hit
Thanks for the bug report. However, Red Hat no longer maintains this version of the product. Please upgrade to the latest version and open a new bug if the problem persists. The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases, and if you believe this bug is interesting to them, please report the problem in the bug tracker at: http://bugzilla.fedora.us/ |
Description of Problem: On a Tyan S2720-based system (Intel E7500 chipset), /proc/ide/piix does not show the correct DMA mode. 'hdparm -iv /dev/hda' and /proc/ide/hda/settings will show UDMA5 while /proc/ide/piix will show UDMA3. Once I force the DMA mode using 'hdparm -X69 /dev/hda', then will piix show UDMA5. I benchmarked the system with and without forcing using hdparm, and both results show UDMA5 performance Version-Release number of selected component (if applicable): RedHat 7.3 Errata (2.4.18-5smp) How Reproducible: Always Steps to Reproduce: 1. see attachment 2 [details]. 3. Actual Results: see attachment Expected Results: expect to see /proc/ide/piix to display UDMA5 without forcing using hdparm. Additional Information: