Messages in this thread | | | Date | Tue, 01 Apr 2003 12:59:46 -0800 | From | "Martin J. Bligh" <> | Subject | [Bug 530] New: dma not enabled for IDE hard drives |
| |
http://bugme.osdl.org/show_bug.cgi?id=530
Summary: dma not enabled for IDE hard drives Kernel Version: 2.5.66 Status: NEW Severity: normal Owner: bugme-janitors@lists.osdl.org Submitter: freelsjd@ornl.gov
Distribution: Debian/Sid
Hardware Environment: dual 2.4Ghz Xeon, SE7500CW2 MB, all Intel Promise PDC20267 ATA-100 ide channels in non-RAID mode
Software Environment: testing with hdparm 5.2-1 of Debian/Sid
Problem Description:
I have similar .config settings for both the 2.4.20 and the 2.5.66 kernels with the identical machine. Under 2.4.20, I do get dma enabled and see good performance (Mb/s) from the hard disk I/O.
However, under the 2.5.66 kernel, dma is not enabled and the performance of the hard drives is poor (~2-3 Mb/s under 2.4.20 versus ~30 Mb/s under 2.5.66). The "hdparm -I /dev/hda" command confirms that dma is not enabled under 2.5.66, but is under 2.4.20.
Steps to reproduce:
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |