Re: [Qemu-block] [Qemu-devel] Request for clarification on qemu-img convert behavior zeroing target host_device

[De Backer, Fred (Nokia - BE/Antwerp)]

>>> Indeed, performance traces are important for issues like this.
>>See strace of both FC27 and FC29 attached

>Looks like you traced only the main thread. All the I/O is done in other 
>threads.
>These flags would be useful:
>
>    strace -o log -f -T -tt

New straces attached with mentioned flags.
Both truncated due to file size at what I believe to be the same position in 
the "write-phase". FC29 has the "zeroing-phase" in front.

Fred

fc27_qemu-img.strace.snip.gz
Description: fc27_qemu-img.strace.snip.gz

fc29_qemu-img.strace.snip.gz
Description: fc29_qemu-img.strace.snip.gz