Red Hat Bugzilla – Bug 185482
DMA cannot be used for IDE on nforce 430 chipset
Last modified: 2012-06-20 09:31:40 EDT
Description of problem: When using any of the released RHEL4 kernels including 2.6.9-34, dma cannot be enabled on IDE drives connected to the nvidia controller on a motherboard with the nforce 430 chipset. All IDE I/O is terribly ssssssllllllooooowwwwwwwww. IMPORTANT NOTE: The OS was installed to drives connected to a 3ware SATA raid controller. Two additional IDE hard drives are connected as hda and hdc and mirrored through software raid for redundancy. Slowness is only related to the IDE drives. I have not tested SATA drives plugged in directly into the Motherboard and not to the 3ware card. I am using the MSI K8NGM2-FID motherboard: http://www.msicomputer.com/product/p_spec.asp?model=K8NGM2-FID&class=mb Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Install RHEL4 2. dmesg shows: ide0: Speed warnings UDMA 3/4/5 is not functional. ide1: Speed warnings UDMA 3/4/5 is not functional. 3. Trying to enable DMA with hdparm shows: [root@roz ~]# hdparm -X69 -d1 /dev/hda /dev/hda: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted setting xfermode to 69 (UltraDMA mode5) using_dma = 0 (off) 4. hdparm -t reports buffered reads of 2MB/s with the hard drive not even mounted or used Current Solution I downloaded, compiled and installed a 2.6.15.6 vanilla kernel on the machine. DMA is enabled correctly and hpdarm -t shows buffered reads of ~57MB/s. The machine is fast now. It would be nice if the appropriate patches can be added to the production RHEL kernels to run the machine in production with a stock kernel.
I have a similar problem, using Intel Corporation 6300ESB SATA Storage Controller, on 2.6.9-34.ELsmp attempt to enable DMA using hdparm: HDIO_SET_DMA failed: Operation not permitted Sata drive is extremely slow /dev/hda: Timing buffered disk reads: 12 MB in 3.14 seconds = 3.83 MB/sec klaas
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