23.08.2010 17:22, Alexander Loob wrote: > Package: qemu-kvm > Version: 0.12.5+dfsg-1 > Severity: normal > Distribution: testing > Architecture: amd64 > > Dear Maintainers, > > after the update to the qemu-kvm package to version 0.12.5+dfsg-1 the > write performance of my virtual machines is absolutely solw! I've tested > this with Windows 7, Windows XP Prof. and debian testing. E.g. nearly 10 > mins for 600MB (Win7 hybernate).
Can you tell me what exactly are you doing when you observe the slowdown? I just tested both 0.12.4 and 0.12.5 on a few windows images I have locally (winXP and win7), -- I see no speed difference in regular operations between the two qemu-kvm versions. > Here is an example of my kvm start parameters: > > kvm \ -drive file=/home/virtual/KVM/win7.ovl,index=0,media=disk,cache=writeback \ -k de \ -m 1536m \ -monitor stdio \ -name "Windows 7" \ -net nic,model=virtio,macaddr=52:54:00:12:34:57 \ -net user \ -rtc base=localtime \ -smp 2 \ -usb \ -usbdevice tablet \ -vga std \ -vnc :3 That makes sense and looks good, except of the -net user, which is terrible slow by its own, but it weren't changed in a very long time. What's win7.ovl? Is it a qcow2 file with a base image elsewhere? > Changing the cache value to cache=none or writethrough has no effect to > the write performance. > > Downgrading back to qemu-kvm-0.12.4+dfsg-1 solved the problem for me > (win7 hybernate writes 600MB in nearly 30 secs.) Why do you think it writes 600Mb? Thanks! /mjt -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
