qcow2_write_compressed in block/qcow2.c would need to be changed. Currently it seems to need bigger changes as it always does compress+write for one block. Not sure, how well it would handle multiple writes in parallel, so the safest would be to avoid that and just wait for the previous writer to finish before starting to write.
-- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/601946 Title: [Feature request] qemu-img multi-threaded compressed image conversion Status in QEMU: New Bug description: Feature request: qemu-img multi-threaded compressed image conversion Suppose I want to convert raw image to compressed qcow2. Multi- threaded conversion will be much faster, because bottleneck is compressing data. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/601946/+subscriptions
