qemu version: 2.9.0 image: centos 7.2 1511 raw cache mode: writeback
In centos7.2 time, the use of writeback and none, the result of dd disk is the same io, no change But I replaced centos7.1 centos7.3 centos7.4 when writeback was significantly faster than none Would like to ask what is going on, how to solve ?
