On 2015-2-8 18:10, Paolo Bonzini wrote: > > > On 07/02/2015 12:26, Wangting (Kathy) wrote: >> OK, Thank you very much for your detailed explanation. >> >> But I have another question about the big change from qemu-1.5.3 to >> qemu-1.6.0-rc0. >> >> When I use ramdisk for IO performance testing, the result is as follows. >> >> [fio-test] rw bs iodepth jobs bw >> iops >> ------------------------------------------------------------------------------------ >> qemu-1.5.3 read 4k 32 1 285MB/s >> 73208 >> qemu-1.6.0-rc0 read 4k 32 1 253MB/s >> 64967 >> >> And virtio-blk is the same. >> >> I know there are so many differences between qemu-1.5 and qemu-1.6, but I am >> confused about >> what new features impact the performance so much. Do you know it? > > No, sorry. Please try newer versions first and see if this was fixed. > QEMU 1.6 is more than a year old. > > Paolo > >
OK, thanks. Ting
