On Thu, Feb 20, 2014 at 01:36:57PM +0100, Alexander Graf wrote: > > On 20.02.2014, at 13:34, Richard W.M. Jones <rjo...@redhat.com> wrote: > > > On Thu, Feb 20, 2014 at 10:23:42AM +0000, Richard W.M. Jones wrote: > >> I am now running a full libguestfs test which will take several hours, > >> but it looks as if -- even if this test fails -- it won't be because > >> of lack of emulation / missing instructions in qemu. > > > > The tests ran. I hit two bugs, but neither seems to be related to > > qemu emulation. Please push these patches into upstream qemu :-) > > They will get into 2.0, no worries :). > > > One bug is in btrfs and is related to page size being different (and > > much larger) on ppc64. > > I remember bugs (oopses) with btrfs when you use a 4k page size created fs > and use it on a 64k page size kernel and vice versa. They still haven't fixed > that?
The failure from the log is: wipefs -a --force /dev/sda1 mkfs.btrfs --alloc-start 0 --byte-count 268435456 --data single --leafsize 4096 --label test --metadata single --nodesize 4096 --sectorsize 512 /dev/sda1 Illegal leafsize (or nodesize) 4096 (smaller than 65536) I have not analysed this beyond simply looking at the command line now, but it seems that this is NOT a bug in btrfs, but a bug in the test suite, selecting a too small --leafsize parameter. Or perhaps a limitation in btrfs. Anyway, doesn't look serious. > > 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. > > qemu spins using 100% of CPU after this. > > How much RAM do you pass into the guest? Could you please try to > increase that size to see whether it makes a difference? If it > doesn't, Aneesh is your man :) In the test case we used -m 768. I reran the test with -m 2048 -- it crashed the same way. I reran the test with -m 20480 -- it crashed the same way. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://people.redhat.com/~rjones/virt-df/
