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Re: [Qemu-devel] [Qemu-block] Request for clarification on qemu-img conv

From: De Backer, Fred (Nokia - BE/Antwerp)
Subject: Re: [Qemu-devel] [Qemu-block] Request for clarification on qemu-img convert behavior zeroing target host_device
Date: Fri, 14 Dec 2018 10:59:15 +0000

>>> 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 
>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.


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

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

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