Re: [Qemu-devel] IO errors in guest caused by LTP dio test

[Kevin Wolf]

Am 27.06.2011 18:08, schrieb Andi Kleen:
> On Mon, Jun 27, 2011 at 05:59:41PM +0200, Kevin Wolf wrote:
>> Am 23.06.2011 01:36, schrieb Andi Kleen:
>>>
>>> Running LTP testcases/kernel/io/direct_io/test_dma_thread_diotest7
>>> causes IO errors in the guest.  There are no IO errors on the host.
>>>
>>> Kernel Linux 3.0.0-rc*
>>> Using a standard emulated IDE -hda image.
>>
>> Couldn't reproduce this in a quick test with a random guest I had
>> available. What is your complete qemu command line? Is the problem new
> 
> -m 1500M -smp 2               \
> -hda ~/qemu/suse-11.1-64.img            \
> -kernel arch/x86/boot/bzImage -append "root=/dev/sda1 debug $EXTRA" "$@" 
> 
> Could it be related to the image?
> 
> suse11.3-64.img: Qemu Image, Format: Qcow , Version: 1 , Disk Size could be: 
> 83886080 * 256 bytes

Oh, this is a qcow1 image? Interesting, I didn't expect that people are
still using this format. :-)

Definitely worth trying a raw image or at least qcow2. The old qcow1
format driver hasn't been actively maintained for quite a while now.

>> with the 3.0 RCs or does it also happen with kernels that my existing
>> guests are likely to have in use - say, the F15 kernel?
> 
> It happened on older kernels too.
>>
>> I guess with virtio-blk you don't see the problems?
> 
> Will try later.

Ok, thanks. It looked like an IDE problem at first, but now that you
mention it's a qcow1 image, I think it could just as well be an image
format driver bug.

Kevin