Red Hat Bugzilla – Bug 187388
IT821x drops interrupts freezing system
Last modified: 2007-11-30 17:11:28 EST
Description of problem:
System freezes when DMA is enabled on IT821x driven disks
Version-Release number of selected component (if applicable):
quite frequently - nearly every time
Steps to Reproduce:
Under anything approaching a reasonable load (such as serving files to windows
clients or NFS clients) the system will freeze completely.
Other causes have been ruled out by eliminating services, and hdparming the DMA
to off completely avoids the problem.
Obviously, I'd expect some reliability in DMA from this driver.
System info: Asus mobo, Celeron (not P4) cpu at 1800MHz, SiS chipset, IT8212 IDE
RAID controller (not in RAID mode)
Actually, the card was in RAID mode. Adding the appropriate kernel parameter to
GRUB to force bypass mode avoids the problem.
(Now I have a memory problem that occasionally locks the system! :-(