Avi Kivity wrote: > > You need to fold the -hda parameter into -driver, so the whole command > line becomes > > qemu-system-x86_64 -m 512 -smp 4 -net > nic,macaddr=00:16:3e:79:0c:db,model=rtl8139 -net > tap,script=/etc/kvm/qemu-ifup -drive > file=/share/ltp_guest.img,cache=writeback > > > -hda is deprecated, it forces cache=writethrough. Okay, cache=writeback can improve 28% performance of diotest, it cost 135 seconds which cost 182 sconds with cache=writethrough. But in the report of bug, there was 2.53 times downgrade performance than before, so maybe still need somewhere tuning. Thanks, Xudong-- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
