Re: Broken sata (VIA) on Asus A8V (kernel 2.6.14+)

[kenneth topp <caught@prodigy.net>]

I'm pretty close to finding irqbalance to be the reason for my similar 
timeouts.  still narrowing down with git bisect, but it's the only 
substantial thing left, which is the smp_affinity fix..

it's a 2.6.14.7 and ~2.6.15-rc4 change.

my timeouts don't occur immediately either.  So what do I look for when 
IRQ get misrouted?  Would it be a driver/device issue?  It seems like I 
have to go back to the point my kernel went MSI and patch it, then bisect 
all over again..

 As well as the ata timeouts leading to permanently D stated pdflushs, the 
other symptom I see is my usb mouse/keyboard occationally types really 
slowly, like 2400bps slow.


the patch that made this issue appear for me:

--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -1937,7 +1937,7 @@ static void ack_edge_ioapic_vector(unsig
{
int irq = vector_to_irq(vector);
- move_irq(vector);
+ move_native_irq(vector);
ack_edge_ioapic_irq(irq);
}
@@ -1952,7 +1952,7 @@ static void end_level_ioapic_vector (uns
{
int irq = vector_to_irq(vector);
- move_irq(vector);
+ move_native_irq(vector);
end_level_ioapic_irq(irq);
}

-

-my /proc/interrupts
  0:       3487    1817855    IO-APIC-edge  timer
  1:          0         60    IO-APIC-edge  i8042
  8:          0          1    IO-APIC-edge  rtc
  9:          0          0   IO-APIC-level  acpi
 14:        534     177341    IO-APIC-edge  ide0
 15:         96      64627    IO-APIC-edge  ide1
169:         16       9846   IO-APIC-level  libata
177:        877     643023   IO-APIC-level  libata, eth0, 
radeon@pci:0000:01:00.0
185:       1146     532391   IO-APIC-level  eth1
193:         16       8392   IO-APIC-level  eth2
201:        173     104730   IO-APIC-level  VIA8237
209:        177     103680   IO-APIC-level  uhci_hcd:usb1, uhci_hcd:usb2, 
uhci_hcd:usb3, ehci_hcd:usb4


Kenneth Topp


------

Vladimir B. Savkin wrote:
> On Thu, Feb 02, 2006 at 08:08:07AM +0900, Tejun Heo wrote:
>
> > Vladimir B. Savkin wrote:
> >
> > > Hello!
> > >
> > > My system based on Asus A8V (VIA chipset) works fine with 2.6.13.3,
> > > but after upgrading (kernels 2.6.14.7 and 2.6.15.1 tried) it
> > > gaves error messages some minutes after boot.
> > >
> > > The messages are as following:
> > > ata2: command 0xXX timeout, stat 0x50 host_stat 0x4
> > > where XX gets different values from time to time, 0x25 mostly.
> > > I/O to this controller halts after that.
> > >
> > > Attached are boot dmesg log and lspci output.
> >
> > How reproducible is the problem?  With how much certainty can you say
> > the problem is introduced by newer kernels?  e.g. If the problem occurs
> > most of the time with 2.5.15.1 but it stops happending after switching
> > back to 2.6.13.3, you can be pretty sure.
>
>
> Highly reproducible: months vs. minutes of uptime.

Your BMDMA controller is reporting raised interrupt (0x4) and your drive
is saying that it's ready for the next command, yet interrupt handler of
sata_via hasn't run and thus the timeout.  It looks like some kind of
IRQ routing problem to me although I have no idea how the problem
doesn't affect the boot process.

Can you try to boot with boot parameter pci=noacpi?

--
tejun
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