Red Hat Bugzilla – Bug 479787
DMA issue for IDE mode of SATA HDD (HDIO_SET_failed)
Last modified: 2009-08-11 17:11:36 EDT
Description of problem:
On our Tylersburg platform, we encounter the IDE DMA problem for RHEL5.2 x86_64. The steps to reproduce are listed as below.
1. attach SATA HDD, and configure BIOS to take it as IDE mode
2. install RHEL 5.2 x85_64
3. check the HDD DMA status by "hdparm /dev/hda" command, it shows that DMA is not enable
4. enable DMA by "hdparm -d 1 /dev/hda", but shows error message as "HDIO_SET_failed: Operation not permitted"
( The screen is captured and saved in attachment. )
Since our Tylersburg platform can not enable DMA in IDE mode, the system got very slow. How could we solve this problem ?
Created attachment 328814 [details]
Please, try to enable the Legacy mode for ATA/IDE in your BIOS and
attach the output of the hdparm -I /dev/hda for the both cases.