Bug 126781
| Summary: | ServerWorks CNB20HE/OSB4 IDE Controller - poor performance | ||||||
|---|---|---|---|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Antimon <antimon+bgz> | ||||
| Component: | kernel | Assignee: | Arjan van de Ven <arjanv> | ||||
| Status: | CLOSED NOTABUG | QA Contact: | Brian Brock <bbrock> | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | rawhide | CC: | alan | ||||
| 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: | 2004-06-26 16:01:28 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: | |||||||
| Attachments: |
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Ultra-DMA is not supported on the OSB4 controller because of problems with the chip occasionally corrupting transfers in UDMA modes with certain disks. Later CSB5/CSB6 devices are supported with full UDMA. If you have two controllers it is best to have CD/DVD devices on the OSB4 (which will do UDMA with these devices) and the disk on the secondary controller. Created attachment 101438 [details]
dmesg from 2.6.6-1.422custom
stripped .config;
#
# ATA/ATAPI/MFM/RLL support
#
CONFIG_IDE=y
CONFIG_BLK_DEV_IDE=y
#
# Please see Documentation/ide.txt for help/info on IDE drives
#
# CONFIG_BLK_DEV_HD_IDE is not set
CONFIG_BLK_DEV_IDEDISK=y
CONFIG_IDEDISK_MULTI_MODE=y
CONFIG_BLK_DEV_IDECD=y
CONFIG_BLK_DEV_IDESCSI=m
CONFIG_IDE_TASKFILE_IO=y
#
# IDE chipset support/bugfixes
#
CONFIG_IDE_GENERIC=y
CONFIG_BLK_DEV_IDEPCI=y
CONFIG_IDEPCI_SHARE_IRQ=y
CONFIG_BLK_DEV_GENERIC=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_IDEDMA_PCI_AUTO=y
CONFIG_BLK_DEV_ADMA=y
CONFIG_BLK_DEV_SVWKS=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_IDEDMA_AUTO=y
|
The problem is very poor IDE performance of a Seagate (hda: ST360021A, ATA DISK drive) which is attached to an onboard ServerWorks CNB20HE chipset to primary 'OSB4' IDE controller. `hdparm -Tt /dev/hda' returns 286.90 MB/s and _only_ 10.25 MB/sec, which is about 4 times slower than what this hdd could perform. DMA is enabled in the BIOS and it works (as hdparm and dmesg say). Version-Release number of selected component (if applicable): kernel-2.6.6-1.422.src.rpm How reproducible: Always Steps to Reproduce: 1.attach IDE drive to any SW OSB4 IDE controller 2.format hdd as ext2 3.hdparm -t /dev/hda returns only ~10MB/s Expected Results: hdparm -t should return ~40MB/s, not ~10MB/s Additional info: DMA is enabled, filesystem is ext2, CPU is 1000MHz PIII. ### hdparm /dev/hda /dev/hda: multcount = 16 (on) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) geometry = 65535/16/63, sectors = 117231408, start = 0 I tried changing controllers, cables and all BIOS settings. Kernel is recompiled from kernel-2.6.6-1.422.src.rpm, the same thing was happening on whole range of 2.4.x kernels, 2.6 kernel fixed the problem of CRC errors on that controller, but poor performance stayed. dmesg attached