[OmniOS-discuss] kvm io 10 times slower after r151010 -> r151012 upgrade

[Michael Mounteney]

On Wed, 10 Dec 2014 06:14:56 +0100 (CET)
Tobias Oetiker <tobi at oetiker.ch> wrote:

> This leads me to suspect, that either only very few people are
> using omnios as a kvm server OR it is also a hardware dependent
> problem.

I think it must be.  I'm running KVM (Gentoo Linux guests) and have
just gone from 151010 to 151012.  I haven't carried-out any
quantitative assessment, but didn't notice any slowdown.  For the
record, my KVM invocation is:

/usr/bin/qemu-system-x86_64 \
        -name "Gentoo "$WHAT \
        -cpu host \
        -boot order=d \
        -enable-kvm \
        -vnc cortex:$VNC \
        -smp 1,maxcpus=1,cores=2 \
        -m 1024 \
        -no-hpet \
        -localtime \
        -kernel /gentoo/kernel-source/linux-3.17.4-gentoo-vbox/arch/x86/boot/bzImage \
        -append "root=/dev/vda1 init=/usr/lib/systemd/systemd quiet" \
        -drive file=/dev/zvol/dsk/rpool/vol/Gentoo-KVM-${WHAT},cache=none,if=virtio,index=0 \
        -drive file=/dev/zvol/dsk/rpool/vol/Linuswap-${WHAT},cache=none,if=virtio,index=1 \
        -net nic,vlan=0,macaddr=$mac,model=virtio,name=ncard1 \
        -net vnic,vlan=0,name=net0,ifname=$VNIC,macaddr=$mac \
        -monitor telnet:127.0.0.1:${monitor},server,nowait \
        -vga std \
        -daemonize

where ${WHAT} is either KDE or XFCE.  Machine is a Supermicro 5017C-LF with 1 x Intel Xeon E3-1240V2 3.40 GHz.4 Cores , 4 Threads,8Mb cache and 8 GiB RAM.

If you are interested in any performance figures, let me know any tar or dd etc. commands you'd like me to run.

Michael.