[Qemu-devel] [Bug 1261268] Re: save guest running time is more than 450s with AVX running.

[Paolo Bonzini]

The bisection is probably incorrect.

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https://bugs.launchpad.net/bugs/1261268

Title:
  save guest running time is more than 450s with AVX running.

Status in QEMU:
  New

Bug description:
  Environment:
  ------------
  Host OS (ia32/ia32e/IA64):ia32e
  Guest OS (ia32/ia32e/IA64):ia32e
  Guest OS Type (Linux/Windows):linux
  kvm.git Commit:d6d63b51fe3bfea0cf596993afa480b0b3b02c32
  qemu.git Commit:8f84271da83c0e9f92aa7c1c2d0d3875bf0a5cb8
  Host Kernel Version:3.13.0-rc1
  Hardware:Romley_EP, Ivytown_EP

  
  Bug detailed description:
  --------------------------
  when guest running avx , then do save /restore, save guest running time is 
too lomg

  
  Note:
  1.when save guest (migrate "exec:dd of=test.img")sometimes , the file of 
test.img is 29G, running time of save guest is about 900s
  2. this should be a qemu bug:
  kvm          + qemu       =  result
  d6d63b51  + 8f84271d =  bad
  d6d63b51  + b5d54bd4 =  good


  
  Reproduce steps:
  ----------------
  1.qemu-system-x86_64 -enable-kvm -m 1024 -smp 6 -net 
nic,macaddr=00:12:34:43:14:78 -net tap,script=/etc/kvm/qemu-ifup rhel6u4.qcow
  2. scp  /usr/tet/XVS/tsets/control_panel/tools/bin/avx.tar.gz $guest_IP:/root
  3. tar -zxf avx.tar.gz
  4. cd /avx
  5. sh chk_avx.sh &>/dev/null &
  6. ctrl-alt-2
  7. migrate "exec:dd of=test.img"

  Current result:
  ----------------
  running time of save guest is more than 450s

  Expected result:
  ----------------
  running time of save guest is less than 450s

  Basic root-causing log:
  ----------------------

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