Re: 2.6.24.X: SATA/AHCI related boot delay. - not with 2.6.24.3

[Tejun Heo]

Hello, Volker.

Volker Armin Hemmann wrote:
> > > In short, no changes at all.
> > Thanks for confirming.
> >
> > Peer, Kuan.  Volker is reporting detection problems on MCP65 AHCI.
> > The followings are what we've discovered till now.
> >
> > 1. When the controller is put into non-raid mode in BIOS
> >
> >   * If softreset is used, either the softreset itself or IDENTIFY
> >     following it times out once.  On retrial, it works fine.  It
> >     doesn't matter whether the SRST is issued by itself or as
> >     follow-up-srst after hardreset.  Using only hardreset works fine.
> >
> >   * The controller doesn't indicate MSI capability and MSI isn't used
> >     by default.
> >
> > 2. When the controller is put into ahci mode in BIOS
> >
> >   * SRST works fine.
> >
> >   * The controller indicates MSI capability but MSI doesn't work
> >     properly resulting in IRQ delivery failure.  Adding
> >     intx_disable_bug quirk doesn't help.
> >
> > I've performed similar test on MCP67 and everything worked fine on it.
> >
> > Both problems (SRST and MSI) can be worked around but I need more
> > information to work around those.
> >
> > * Which chips are affected?  Are there proper fixes?
> >
> > * For the MSI problem, is it system wide problem or local to the ahci
> >   controller?
>
>
> I rebooted with non-raid set, without pci=nomsi
>
> this is cat /proc/interrupts:
>           CPU0       CPU1
>   0:         57          1   IO-APIC-edge      timer
>   1:          0         81   IO-APIC-edge      i8042
>   8:          0          1   IO-APIC-edge      rtc
>   9:          0          1   IO-APIC-fasteoi   acpi
>  12:          0          3   IO-APIC-edge      i8042
>  17:          2       2868   IO-APIC-fasteoi   nvidia
>  18:          0          0   IO-APIC-fasteoi   EMU10K1
>  22:          4        745   IO-APIC-fasteoi   ehci_hcd:usb1
> 314:          0        158   PCI-MSI-edge      eth0
> 315:          7      12769   PCI-MSI-edge      ahci
>
> as you can see, only the sata controller and the network uses msi.
>
> And networking works - or I wouldn't be able to send you this mail.

I guess the ahci controller works too.  This is getting confusing, so 
MSI doesn't work iff the controller is configured as ahci in BIOS?

> I will reboot from systemresucecd later today and post some results with 
> ahci-mode set, no nomsi. Just can't try patches that way.

Is sytemrescuecd using the same kernel?  Otherwise, it will only add 
more to the confusion.

--
tejun
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