I'm running the most recent release of KVM, version 0.14.0
on a host kernel 2.6.32.15, and seem to be able to trigger
a leak of memory pretty easily.
Inside a guest the following one-liner will cause the KVM
process on the host to gradually increase its memory
consumption:
while true; do
wget http://mirror.bytemark.co.uk/misc/test-files/500M; cp 500M new; rm 500M new; sleep 10 ;
done
The guest is launched using loopback files:
"/opt/kvm/bin/qemu-system-x86_64 -m 500 -drive
file=/machines/kvm6/jail/root_fs,if=virtio,cache=off -drive
file=/machines/kvm6/jail/swap_file,if=virtio,boot=off -net
nic,macaddr=fe:ff:00:00:5a:cb,model=virtio -net
tap,ifname=tap_kvm6,script=no -pidfile /var/kvm/kvm6.pid -name kvm6
-serial /dev/tty -no-reboot -monitor
unix:/var/kvm/kvm6.mon,server,nowait -kernel
/machines/kvm6/jail/linux -append root=/dev/vda clocksource=acpi_pm
notsc console=tty0 console=ttyS0,115200n8 -nographic -boot c
"
So we're using an external code, and the virtio for both block
and NIC. Using e1000, rtl8139, or virtio for the NIC results in the
same leak.
top shows this:
23074 kvm6 20 0 656m 515m 1060 S 0.0 0.8 13:10.79 qemu-system-x86
So 656Mb virt, 515Mb resident, and over time the virtual memory
increases significantly.
Should I be blaming KVM for this leak? Or is it possible it is either
the host or the guest kernels? Any assistance in tracking down the
leak is most welcome - even vague hints.
If helpful I'd be happy to share logins to either a host or a leaky
guest, or both.
Steve Kemp
--
Bytemark Hosting
http://www.bytemark.co.uk/
phone UK: 0845 004 3 004
Dedicated Linux hosts from 15ukp ($30) per month
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