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    SubjectRe: SMP+nosmp=hang [was: Re: 2.6.15-rc5-mm2]
    On Fri, 20 Jan 2006 19:22:59 -0800, Andrew Morton <akpm@osdl.org> wrote:

    > "J.A. Magallon" <jamagallon@able.es> wrote:
    > >
    > > On Sun, 11 Dec 2005 04:13:08 -0800, Andrew Morton <akpm@osdl.org> wrote:
    > >
    > > >
    > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.15-rc5/2.6.15-rc5-mm2/
    > > >
    > >
    > > Booting a SMP built kernel with 'nosmp' just hangs at the VFS layer, with
    > > the message about 'not being able to find root device sda1'.
    > > sda is a SATA drive on an Intel ICH5 controller:
    > >
    > > libata version 1.20 loaded.
    > > ata_piix 0000:00:1f.2: version 1.05
    > > ACPI: PCI Interrupt 0000:00:1f.2[A] -> GSI 18 (level, low) -> IRQ 16
    > > PCI: Setting latency timer of device 0000:00:1f.2 to 64
    > > ata1: SATA max UDMA/133 cmd 0xC000 ctl 0xC402 bmdma 0xD000 irq 16
    > > ata2: SATA max UDMA/133 cmd 0xC800 ctl 0xCC02 bmdma 0xD008 irq 16
    > > ata1: dev 0 cfg 49:2f00 82:346b 83:7d01 84:4003 85:3469 86:3c01 87:4003 88:407f
    > > ata1: dev 0 ATA-6, max UDMA/133, 390721968 sectors: LBA48
    > > ata1: dev 0 configured for UDMA/133
    > > scsi0 : ata_piix
    > > ATA: abnormal status 0x7F on port 0xC807
    > > scsi1 : ata_piix
    > > Vendor: ATA Model: ST3200822AS Rev: 3.01
    > > Type: Direct-Access ANSI SCSI revision: 05
    > > SCSI device sda: 390721968 512-byte hdwr sectors (200050 MB)
    > > SCSI device sda: drive cache: write back
    > > SCSI device sda: 390721968 512-byte hdwr sectors (200050 MB)
    > > SCSI device sda: drive cache: write back
    > > sda: sda1 sda2 sda3
    > > sd 0:0:0:0: Attached scsi disk sda
    > >
    > > I would have to double check, but I think it even missed the USB keyboard.
    > >
    >
    > Is this still happening?

    Yes. I have just tried with 2.6.16-rc1-mm2, and the result is the same.
    No root device.

    The nosmp-booted kernel looks much much slow than the SMP one, it takes
    ages to detect devices like usb ones, and even spent about 20 seconds here:

    [ 0.431601] libata version 1.20 loaded.
    [ 0.431652] ata_piix 0000:00:1f.2: version 1.05
    [ 0.431670] ACPI: PCI Interrupt 0000:00:1f.2[A] -> GSI 18 (level, low) -> IRQ 16
    [ 0.431792] PCI: Setting latency timer of device 0000:00:1f.2 to 64
    [ 0.431852] ata1: SATA max UDMA/133 cmd 0xC000 ctl 0xC402 bmdma 0xD000 irq 16
    [ 0.431950] ata2: SATA max UDMA/133 cmd 0xC800 ctl 0xCC02 bmdma 0xD008 irq 16
    >>>>>>>>>>>>> here <<<<<<<<<<<<<<<<<<
    [ 0.690451] ata1: dev 0 cfg 49:2f00 82:346b 83:7d01 84:4003 85:3469 86:3c01 87:4003 88:407f
    [ 0.690456] ata1: dev 0 ATA-6, max UDMA/133, 390721968 sectors: LBA48
    [ 0.696278] ata1: dev 0 configured for UDMA/133
    [ 0.701627] scsi0 : ata_piix
    [ 1.937443] scsi1 : ata_piix

    and it did not detect any drive, so the no-root-device error. This one can be
    a detection timeout, but as I say also the USB detection is dog slooow.

    Need some info ? .config, or the like ?

    --
    J.A. Magallon <jamagallon()able!es> \ Software is like sex:
    werewolf!able!es \ It's better when it's free
    Mandriva Linux release 2006.1 (Cooker) for i586
    Linux 2.6.15-jam5 (gcc 4.0.2 (4.0.2-1mdk for Mandriva Linux release 2006.1))
    [unhandled content-type:application/pgp-signature]
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