Hello! I just tested qemu-kvm-0.11.0 with the KVM module of kernel 2.6.31.1. I noticed that the I/O performance of an unattended stock Debian Lenny install dropped somehow. The test machines ran with kvm-88 and 2.6.30.x before. The difference is very noticeable (went from about 5 minutes up to 15-25 minutes). The two test machines have different CPUs (one is an Intel Core2 CPU, the other runs with an AMD Athlon 64 X2 Dual). Is this the effect of added code regarding caching/data integrity to the VirtIO block layer or somewhere else? The qemu-system-x86_64 seems to hang a lot more in heavy I/O (showing 'D' in top/htop). The command line is quite straight-forward: qemu-system-x86_64 -drive file=debian.qcow2,if=virtio,boot=on -cdrom \ /srv/isos/debian-502-i386-netinst.iso -smp 2 -boot d -m 512 -net nic \ -net user -usb Installation was repeated multiple times, every time the test machines hat no other load. The effect is the same with a Windows XP guest running without VirtIO. Best, René. -- )\._.,--....,'``. fL Let GNU/Linux work for you while you take a nap. /, _.. \ _\ (`._ ,. R. Pfeiffer <lynx at luchs.at> + http://web.luchs.at/ `._.-(,_..'--(,_..'`-.;.' - System administration + Consulting + Teaching - Got mail delivery problems? http://web.luchs.at/information/blockedmail.php
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