Re: [Libguestfs] [Qemu-devel] Effect of qemu-img convert -m and -W options
On Thu, Nov 16, 2017 at 03:51:29PM +0100, Peter Lieven wrote:
Afaik all writes to the same QCOW2 serialize because of the
s->lock that
is held during the write. So its not suprising that there is no benefit from
mutliple threads as long as reading from the RAW file involves no delay.
Which is likely due to readahead of the OS.
I guess this would explain it, thanks.
Rich.
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