Hi ! Here's my config : Version : qemu-kvm-0.12.5, qemu-kvm-0.12.4 Hosts : AMD 64X2, Phenom and Core 2 duo OS : Slackware 64 13.0 Kernel : 2.6.35.4 and many previous versions I use a PXE server to boot semi-diskless (swap partitions and some local stuff) stations. This server also serves a read-only nfs folder, with plenty of .img on it. When clients connects, a relative image is created in /tmp, which is a tmpfs, so hosted in ram. And here i go on my 2G stations : qemu-system-x86_64 -m 1024 -vga std -usb -usbdevice tablet -localtime -soundhw es1370 /tmp/relimg.img qemu-system-x86_64 -m 1024 -vga std -usb -usbdevice tablet -localtime -soundhw es1370 /dev/shm/relimg.img I tried both. Always the same result : the ram is consumed quickly, and mass swap occurs. On a 4G system, i see kvm uses more than 1024, maybe 1200. And everytime a launch a program inside the vm, the amount of the host free ram (not cached) diminishes, which is weird, because it should have been reserved. So on a 2G system, swap occurs very fast and the machine slow a lot down. An on a total diskless system, this leads fast to a freeze. I have no problem if i use a relative image on disk : qemu-system-x86_64 -m 1024 -vga std -usb -usbdevice tablet -localtime -soundhw es1370 -drive file=/mnt/hd/sda/sda1/tmp/relimg.img,cache=none -- 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