[Qemu-devel] [Bug 855633] Re: guest boots up too slowly

[Yongjie Ren]

It's the same reason as the following bug.    
https://bugs.launchpad.net/qemu/+bug/882358

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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 <address@hidden>
  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.)

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