Il 21/03/2014 12:49, Peter Lieven ha scritto:
A 10G logical volume was created and filled with random data. Then the logical volume was exported via qemu-img convert to an iscsi target. Before the export was started all caches of the linux kernel where dropped.Old behavior: - The convert process took 3m45s and the buffer cache grew up to 9.67 GB close to the end of the conversion. After qemu-img terminated all the buffers were freed by the kernel. New behavior with the -N switch: - The convert process took 3m43s and the buffer cache grew up to 15.48 MB close to the end with some small peaks up to 30 MB durine the conversion. Signed-off-by: Peter Lieven <p...@kamp.de> --- v1->v2: - added test example to commit msg - added -N knob to qemu-img
I'm sorry, I cannot find the original discussion. Why is the new knob needed?
Paolo
