> > 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 <at> vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > I am also looking for a "speed solution" so i put the whole image in /dev/shm. host machine is ubuntu 11.10 betha , and guest is ubuntu 11.04. it works , and i get 500mbyte/sec using virtio. .. I was hoping for a lot of more since its a i920 , 24gig host machine. I will try disable the cache i guess it will improve the speed. My question is , what would the optimal filesystem of the guest be ? om using ext4 , but its a bit silly since the the host kvm image is in ram. ..ive got 12g /dev/shm , since the hostmache is 24gb. my kvm image is 6 gig. /Rickard -- 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
