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DateThu, 03 Apr 2008 14:26:12 +0900
FromTejun Heo <>
SubjectRe: 2.6.24.X: SATA/AHCI related boot delay. - not with 2.6.24.3
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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