It's the same reason as the following bug. https://bugs.launchpad.net/qemu/+bug/882358
-- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/855633 Title: guest boots up too slowly Status in QEMU: Fix Released Bug description: qemu.git (memory/queue branch) commit: 6cc7686696f73ae87cadef4450776a488b0e0c8b or qemu.git (master branch) commit: 8843cf40c0f482949e6ae9d0119e45d6b96fe890 kvm.git commit: 7f914d61cd2156e34a7852462bb4932621f33a34 It will costs about 180 seconds to booting up a rhel6 guest. But when I use qemu.git with commit edbb7c0, the rhel6 guest can boot up in about 50 seconds. I did the comparative test in the same box and using the same command line to create a guest. I found this bug in memory/queue branch of qemu.git on September 21st. As some codes in memory branch were merged into master branch, the master tree of qemu.git also has this issue now. I found the following log in master tree. And that merger maybe introduced this issue in master tree. commit 36f490b176afab3096e9c2877b365354f67e269d Merge: ebffe2a 0d95952 Author: Anthony Liguori <aligu...@us.ibm.com> Date: Fri Oct 14 10:44:52 2011 -0500 Merge remote-tracking branch 'qemu-kvm-tmp/memory/batch' into staging Reproduce steps: ---------------- 1.with latest qemu.git master tree, to create a guest: qemu-system-x86_64 -m 1024 -smp 2 -hda /root/rhel6.img (It maybe cost about 180 seconds to boot up.) To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/855633/+subscriptions
