Public bug reported:
Hello,
Problem:
KVM guest's CPU usage goest upto 100% and more (if multi-proc or multi-cores)
and makes guest running slowly for period of time when the flush process is
running on a virtio storage drive.
How to get this problem:
just start the guest with virtio storage driver and make the guest do some
storage related work (ie apt-get install mc) and watch top. after 2-3 sec the
cpu usage will go to 100% and guest will run slowly (so slow, that even munin
processes cant do their work in 5 minutes and create an e-mail report, that
there are various .lock files present)
host:
ubuntu 10.04.1 LTS
2.6.32-27-server x86_64
2x Intel(R) Xeon(R) CPU E5620 (total of 16 cpus for os)
12GB RAM
2x software raids:
160GB and 2TB
the 160GB one is for system and 2TB one is for kvm images
guest:
Ubuntu 10.04.1 LTS
Disk: virtio
network: virtio
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
869 root 20 0 0 0 0 S 117 0.0 0:17.80 flush-252:0
252 is the vda disk:
monitor@monitor:~$ ls -l /dev/vda
brw-rw---- 1 root disk 252, 0 2011-01-13 16:44 /dev/vda
** Affects: kvm (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/703811
Title:
kvm guest's cpu usage with virtio storage driver goes up to 100%
because of flush process
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