Hi, > If you are using virtio drivers in the guest (which I presume you are given the reference to /dev/vda), try using the following -drive syntax: > > -drive file=/dev/mapper/ioband1,if=virtio,boot=on,cache=off > > This will force the use of O_DIRECT. By default, QEMU does not open with O_DIRECT so you'll see page cache effects. Thank you for your suggestion. I was using virtio drives as you wrote. I just thought that kvm would use O_DIRECT option when applications on the guest opened files with O_DIRECT option. I'll try the way you mentioned and report back. Thanks, Ryo Tsuruta -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
