[Bug 352197] Re: ata timeout exception with ahci libata driver (was with 2.6.28-11, but i confirmed it affewcts previous kernels too)

[stecklum]

I recently switched to 2.6.31 and had the impression that the timeout
behavior got worse. Anyway, I stumbled about this post
http://www.nvnews.net/vbulletin/showthread.php?t=149171 which suggests
to use "options nvidia NVreg_EnableMSI=1" in /etc/modprobe.d/options to
cure freeze problems. That's what I did and now the timeout issue seems
to be gone indeed. It looks it is in fact caused by interrupt problems
between the SATA and NVIDIA drivers which go away with MSI. Listed
/proc/interrupts for completeness

           CPU0       CPU1       
  0:    1184963      71677   IO-APIC-edge      timer
  1:       3085         90   IO-APIC-edge      i8042
  8:          0          1   IO-APIC-edge      rtc0
  9:          8          2   IO-APIC-fasteoi   acpi
 12:      10773       3051   IO-APIC-edge      i8042
 14:      96639       5469   IO-APIC-edge      ata_piix
 15:          0          0   IO-APIC-edge      ata_piix
 18:          7          4   IO-APIC-fasteoi   mmc0
 19:        155          4   IO-APIC-fasteoi   firewire_ohci
 20:      56051       1330   IO-APIC-fasteoi   ehci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb5
 21:          0          0   IO-APIC-fasteoi   uhci_hcd:usb4, uhci_hcd:usb6
 22:       1887         82   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb7
 29:      56631       3275   PCI-MSI-edge      ahci
 30:          0          0   PCI-MSI-edge      HDA Intel
 31:       5445       9636   PCI-MSI-edge      eth0
 32:         64         69   PCI-MSI-edge      iwlagn
 33:     186568       1057   PCI-MSI-edge      nvidia
NMI:          0          0   Non-maskable interrupts
LOC:     198888     518921   Local timer interrupts
SPU:          0          0   Spurious interrupts
CNT:          0          0   Performance counter interrupts
PND:          0          0   Performance pending work
RES:     146977     286978   Rescheduling interrupts
CAL:       5637      20157   Function call interrupts
TLB:        766       1110   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
MCE:          0          0   Machine check exceptions
MCP:         36         35   Machine check polls
ERR:          0
MIS:          0

-- 
ata timeout exception with ahci libata driver (was with 2.6.28-11, but i confirmed it affewcts previous kernels too)
https://bugs.launchpad.net/bugs/352197
You received this bug notification because you are a member of Kernel
Bugs, which is subscribed to linux in ubuntu.