Re: [Qemu-devel] [PATCH 00/28] target-ppc: Altivec 2.07

[Thomas Huth <thuth@linux.vnet.ibm.com>]

On Thu, 20 Feb 2014 12:34:00 +0000
"Richard W.M. Jones" <rjones@redhat.com> wrote:

[...]
> 
> The second bug is kind of interesting.  If you add ~ 256 disks (using
> virtio-scsi), then it looks as if the firmware crashes.  The total
> console output is below.  It looks as if "c >" is some kind of prompt.

Yes, that's the Open Firmware prompt of the SLOF firmware here. If you
know how to program in Forth, you can use it to debug the system.

> Populating /vdevice methods
> Populating /vdevice/vty@30000000
> Populating /vdevice/nvram@71000000
> C0580\b\b\b\b\bC05A0\b\b\b\b\bPopulating /pci@800000020000000
> ^M Adapters on 0800000020000000
>                      00 0000 (D) : 106b 003f    serial bus [ usb-ohci ]
>                      00 0800 (D) : 1af4 1004    virtio [ scsi ]
> Populating /pci@800000020000000/scsi@1
>        SCSI: Looking for devices
>           100000000000000 DISK     : "QEMU     QEMU HARDDISK    1.7."
>           101000000000000 DISK     : "QEMU     QEMU HARDDISK    1.7."
>           102000000000000 DISK     : "QEMU     QEMU HARDDISK    1.7."
>           103000000000000 DISK     : "QEMU     QEMU HARDDISK    1.7."
>           104000000000000 DISK     : "QEMU     QEMU HARDDISK    1.7."
>           105000000000000 DISK     : "QEMU     QEMU HARDDISK    1.7."
>           106000000000000 DISK     : "QEMU     QEMU HARDDISK    1.7."
>           107000000000000 DISK     : "QEMU     QEMU HARDDISK    1.7."
>           108000000000000 DISK     : "QEMU     QEMU HARDDISK    1.7."
> C0600\b\b\b\b\bC0640\b\b\b\b\bC0690\b\b\b\b\bC06A0\b\b\b\b\bC06A8\b\b\b\b\bC06B0\b\b\b\b\bC06B8\b\b\b\b\bC06C0\b\b\b\b\b 

So the last successful checkpoint seems to be C06C0 ? Looking at
https://github.com/aik/SLOF/blob/master/board-qemu/slof/tree.fs
there is not much critical stuff going on between that checkpoint and
the next one, so I guess the firmware just ran out of internal memory.

When you run into this crash again, could you try to enter the
following commands? They might help to confirm my suspicion:

 .free
 .available
 here .

Please also say how much memory you were using for the guest.

 Thomas