Avi Kivity wrote:
On 10/20/2009 06:03 PM, Tomasz Chmielewski wrote:
On a 8 CPU host, I created a guest with 4 CPUs (-smp 4).
Unfortunately, the guest only uses one host CPU.
For example, running "cat /dev/urandom | gzip -9 >/dev/null &" several
times on this guest causes load on only one host CPU.
Is it expected?
No. What does 'top -H' show?
In the guest - 4 CPUs with ~100% usage each (when I press "1"), otherwise, in the task
list, multiple "cat" processes taking most CPU time (as it reads from /dev/urandom).
In the host - qemu-system-x86 (one process/thread) taking ~100% CPU; when I press
"1", I see only one CPU is used 100%, 7 other CPUs are more or less not used.
guest command line:
/usr/bin/qemu-system-x86_64 -m 1024 -drive
file=/srv/kvm/images/lvs2,if=virtio,cache=writeback,index=0,boot=on -net
nic,vlan=0,model=virtio,macaddr=F2:4A:51:41:B1:3F -net
tap,vlan=0,script=/etc/qemu-ifup -localtime -smp 4
There are 5 other guests (1 CPU) started before this guest.
--
Tomasz Chmielewski
http://wpkg.org
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