Le Lundi 24 Avril 2006 03:57, Shaohua Li a écrit :
> Hi,

Hello, 
>
> On Sun, 2006-04-23 at 14:15 -0700, Andrew Morton wrote:
> > Kevin Baradon <kevin.baradon@gmail.com> wrote:
> > > Hello,
> > >
> > > Starting with kernel 2.6.17-rc1 (also happens with 2.6.17-rc2), second
> > > logical-CPU of my Hyperthreading system no longer boots.
> > >
> > > I tracked up changes in APIC code, and it appears reverting commit
> > > 7c5c1e427b5e83807fd05419d1cf6991b9d87247 fixes this bug.
> >
> > That helps heaps, thanks.
>
> The commit doesn't look like the root cause to me. BIOS already assigns
> unique id to ioapic, and the cpu family is 15, so with/without the patch
> the code path hasn't any difference. Kevin, can you please make a clean
> build and check if the patch is the real cause?
>

You were right. Reverting this commit helps sometimes, but doesn't work 
reliably. When my computer booted this morning, I've had only one CPU 
detected. I've tried booting several times, even with a complete power down. 
Nothing changed. 

I've also tried with kernel 2.6.16-rc6, which booted fine and detected two 
CPUs.

I've applied your small patch. Debugging output is attached.

If you want, I can apply this small patch also to kernel 2.6.16-rc6, and send 
you debugging output.

> If it still doesn't work, you might apply a small change below to
> include/asm-i386/apic.h, and attach the dmesg, so we could analyze it.
>

File attached.

> -#define Dprintk(x...)
> +#define Dprintk(format, arg...) printk(format, ##arg)
>
> > > See both dmesgs, and kernel configuration attached.
> > >
> > > Feel free to ask me if you need other informations.
> > > Please CC me as I'm not subscribed to LKML.
> > >
> > >
> > > Hardware :
> > > ------------------------------
> > > MB: Gigabyte GA-8SINXP1394
> > > CPU: Intel Pentium 4 3.06Ghz HT
> > > RAM: Corsair 512Mo
> > >
> > > cat /proc/cpuinfo: (patched kernel)
> > > ------------------------------
> > > processor       : 0
> > > vendor_id       : GenuineIntel
> > > cpu family      : 15
> > > model           : 2
> > > model name      : Intel(R) Pentium(R) 4 CPU 3.06GHz
> > > stepping        : 7
> > > cpu MHz         : 3081.400
> > > cache size      : 512 KB
> > > physical id     : 0
> > > siblings        : 2
> > > core id         : 0
> > > cpu cores       : 1
> > > fdiv_bug        : no
> > > hlt_bug         : no
> > > f00f_bug        : no
> > > coma_bug        : no
> > > fpu             : yes
> > > fpu_exception   : yes
> > > cpuid level     : 2
> > > wp              : yes
> > > flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
> > > bogomips        : 6165.74
> > >
> > > processor       : 1
> > > vendor_id       : GenuineIntel
> > > cpu family      : 15
> > > model           : 2
> > > model name      : Intel(R) Pentium(R) 4 CPU 3.06GHz
> > > stepping        : 7
> > > cpu MHz         : 3081.400
> > > cache size      : 512 KB
> > > physical id     : 0
> > > siblings        : 2
> > > core id         : 0
> > > cpu cores       : 1
> > > fdiv_bug        : no
> > > hlt_bug         : no
> > > f00f_bug        : no
> > > coma_bug        : no
> > > fpu             : yes
> > > fpu_exception   : yes
> > > cpuid level     : 2
> > > wp              : yes
> > > flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
> > > bogomips        : 6162.10
> > >
> > > cat /proc/interrupts :  (patched kernel)
> > > -----------------------------
> > >            CPU0       CPU1
> > >   0:    2143303       6647    IO-APIC-edge  timer
> > >   1:         15          9    IO-APIC-edge  i8042
> > >   4:          7          1    IO-APIC-edge  serial
> > >   8:      19518          1    IO-APIC-edge  rtc
> > >   9:          0          0   IO-APIC-level  acpi
> > >  15:      37053         23    IO-APIC-edge  ide1
> > >  16:     240872          1   IO-APIC-level  cx88[0], eth-lan
> > >  17:      11128         19   IO-APIC-level  ide2, ide3
> > >  18:      63432          4   IO-APIC-level  libata, ohci1394, CS46XX
> > >  19:          0          3   IO-APIC-level  ehci_hcd:usb1
> > >  20:     457635        195   IO-APIC-level  ohci_hcd:usb2
> > >  21:          0          0   IO-APIC-level  ohci_hcd:usb3
> > >  22:          0          0   IO-APIC-level  ohci_hcd:usb4
> > > NMI:    2149889    2149786
> > > LOC:    2150122    2150121
> > > ERR:          0
> > > MIS:          0
> >
> > Shaohua, I'll queue up a reversion patch so this doesn't get forgotten
> > about but I won't send it to Linus at this stage.
>
> Thanks, Andrew.
>
> Thanks,
> Shaohua

-- 
Kevin Baradon
Telecom Student
-