[XenPPC] dom0 boots to nfsroot on JS21

[Amos Waterland <apw@xxxxxxxxxx>]

With current PPC Xen, dom0 is able to boot and mount an nfsroot on the
JS21 blade I have access to.  I can ssh in and run standard tools like gcc.

There seem to be some questions about the current stability of this
JS21+SLOF+XEN+DOM0 combination, but at least with a NFS root it seems
quite stable.  I ran `stress -c 4 -m 1 --vm-bytes 20M -i 1' for a good
half-hour with no problems.

I then formated the disk drive with an ext2 partition and mounted it
under /mnt/sda1.  I ran the following for a half-hour with no problems:
`while true; do cp /etc/passwd /mnt/sda1 && sync || break; done'

While running `stress -d 1' I did immediately see the kernel's OOM
killer fire, but since dialing back the size of the buffer that stress
writes to the disk with the `--hdd-bytes 20M' option stops it from
triggering, I think it was simply a natural consequence of having only
64MB allocated to the partition.

I am getting random SSH hangups though, usually but not always after
doing something that causes a lot of console output.  The message from
my client looks like `Disconnecting: Bad packet length 3890534716.'
The effect does not seem to be permanent, as I can immediately ssh back in.


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