On Sat, 02/22 14:00, Peter Lieven wrote: > this patch tries to optimize zero write requests > by automatically using bdrv_write_zeroes if it is > supported by the format. > > i know that there is a lot of potential for discussion, but i would > like to know what the others think. > > this should significantly speed up file system initialization and > should speed zero write test used to test backend storage performance. > > the difference can simply be tested by e.g. > > dd if=/dev/zero of=/dev/vdX bs=1M > > Signed-off-by: Peter Lieven <p...@kamp.de> > ---
With this patch, is is still possible to actually do zero fill? Prefill is usually writing zeroes too, but according to the semantic, bdrv_write_zeroes may just set L2 entry flag without allocating clusters, which won't satisfy that. Thanks, Fam
