Public bug reported:
I'm running a QQ host (i7-860); I've got a VM that I'm testing the new debian
installer in; the VM is
backed onto a raw LVM partition, on an otherwise idle 7200RPM SATA disk
(manages about 120MB/s write)
With the debian installer 'Erasing data on Virtual disk 1, partition #5 (Vda5)'
- it's going very slowly;
it's been doing that erase for >15 mins on the 20GB guest partition.
The host is showing a load average of 13; with 80% CPU idle; top shows the only
thing bust is kvm, but iotop is
showing loads of kvm threads doign IO - the cumulative throughput is only about
5MB/s which is a bit grim:
iostat:
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
sda 0.00 173.50 0.00 2763.00 0.00 5874.00 4.25
11.52 4.21 0.00 4.21 0.33 91.60
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00
sdc 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00
...
dm-9 0.00 0.00 0.00 2938.50 0.00 5888.00 4.01
12.38 4.25 0.00 4.25 0.31 91.40
iotop:
10442 be/4 libvirt- 0.00 B/s 257.08 K/s 0.00 % 25.17 % kvm -name debian
~us=pci.0,addr=0x6
10438 be/4 libvirt- 0.00 B/s 253.24 K/s 0.00 % 24.73 % kvm -name debian
~us=pci.0,addr=0x6
10425 be/4 libvirt- 0.00 B/s 253.24 K/s 0.00 % 24.28 % kvm -name debian
~us=pci.0,addr=0x6
10436 be/4 libvirt- 0.00 B/s 249.40 K/s 0.00 % 23.58 % kvm -name debian
~us=pci.0,addr=0x6
10428 be/4 libvirt- 0.00 B/s 237.89 K/s 0.00 % 23.14 % kvm -name debian
~us=pci.0,addr=0x6
10427 be/4 libvirt- 0.00 B/s 245.57 K/s 0.00 % 23.05 % kvm -name debian
~us=pci.0,addr=0x6
10440 be/4 libvirt- 0.00 B/s 253.24 K/s 0.00 % 23.01 % kvm -name debian
~us=pci.0,addr=0x6
10431 be/4 libvirt- 0.00 B/s 245.57 K/s 0.00 % 22.92 % kvm -name debian
~us=pci.0,addr=0x6
10418 be/4 libvirt- 0.00 B/s 241.73 K/s 0.00 % 22.50 % kvm -name debian
~us=pci.0,addr=0x6
10422 be/4 libvirt- 0.00 B/s 245.57 K/s 0.00 % 22.37 % kvm -name debian
~us=pci.0,addr=0x6
10424 be/4 libvirt- 0.00 B/s 245.57 K/s 0.00 % 22.33 % kvm -name debian
~us=pci.0,addr=0x6
10443 be/4 libvirt- 0.00 B/s 241.73 K/s 0.00 % 22.31 % kvm -name debian
~us=pci.0,addr=0x6
10421 be/4 libvirt- 0.00 B/s 245.57 K/s 0.00 % 22.15 % kvm -name debian
~us=pci.0,addr=0x6
10432 be/4 libvirt- 0.00 B/s 241.73 K/s 0.00 % 22.05 % kvm -name debian
~us=pci.0,addr=0x6
10434 be/4 libvirt- 0.00 B/s 249.40 K/s 0.00 % 22.03 % kvm -name debian
~us=pci.0,addr=0x6
10429 be/4 libvirt- 0.00 B/s 249.40 K/s 0.00 % 21.99 % kvm -name debian
~us=pci.0,addr=0x6
10430 be/4 libvirt- 0.00 B/s 257.08 K/s 0.00 % 21.99 % kvm -name debian
~us=pci.0,addr=0x6
10423 be/4 libvirt- 0.00 B/s 245.57 K/s 0.00 % 21.80 % kvm -name debian
~us=pci.0,addr=0x6
10433 be/4 libvirt- 0.00 B/s 249.40 K/s 0.00 % 21.62 % kvm -name debian
~us=pci.0,addr=0x6
10437 be/4 libvirt- 0.00 B/s 245.57 K/s 0.00 % 21.57 % kvm -name debian
~us=pci.0,addr=0x6
10419 be/4 libvirt- 0.00 B/s 237.89 K/s 0.00 % 21.39 % kvm -name debian
~us=pci.0,addr=0x6
10439 be/4 libvirt- 0.00 B/s 237.89 K/s 0.00 % 21.06 % kvm -name debian
~us=pci.0,addr=0x6
10426 be/4 libvirt- 0.00 B/s 237.89 K/s 0.00 % 20.80 % kvm -name debian
~us=pci.0,addr=0x6
10441 be/4 libvirt- 0.00 B/s 237.89 K/s 0.00 % 20.48 % kvm -name debian
~us=pci.0,addr=0x6
10435 be/4 libvirt- 0.00 B/s 234.06 K/s 0.00 % 19.80 % kvm -name debian
~us=pci.0,addr=0x6
1 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % init
A bit difficult to say if this is a kernel or kvm issue; but it doesn't
seem to fair to blame the debian installer for that load/behaviour on
the host
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: kvm (not installed)
ProcVersionSignature: Ubuntu 3.5.0-9.9-generic 3.5.0
Uname: Linux 3.5.0-9-generic x86_64
ApportVersion: 2.4-0ubuntu6
Architecture: amd64
Date: Sun Aug 12 19:03:59 2012
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120717)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-9-generic
root=UUID=711860b7-f028-46b1-83bb-c2be5dc8044d ro nointremap quiet splash
vt.handoff=7
SourcePackage: qemu-kvm
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/10/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.50
dmi.board.name: P55M Pro
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrP1.50:bd09/10/2009:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnP55MPro:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
** Affects: qemu-kvm (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal
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https://bugs.launchpad.net/bugs/1035921
Title:
odd IO/load behaviour running debian installer guest
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