[OmniOS-discuss] horrible disk performance under KVM

[ashley willis]

So, a CentOS 6.4 VM is still horrible with virtio -- it's loaded 2% of
the database in 6 minutes onto a 30g ext4 partition.

On Fri, Sep 13, 2013 at 4:24 PM, ashley willis <ashleywillis76 at gmail.com> wrote:
> that works for booting centos 6.4, but not for booting omnios -- grub
> comes up but it keeps looping back to the grub menu. granted, i don't
> really need to boot omnios in kvm. i had horrible performance in
> centos as well, so i will try this.
>
> for comparison to my home machine, on a work server i loaded that same
> dataset in 4m10s (xeon 2*6 cores, 60GB ram, 12 600GB 10k SAS drives in
> raid10) reading from disks in a different box.
>
> -ashley
>
> On Fri, Sep 13, 2013 at 3:50 PM, Narayan Desai <narayan.desai at gmail.com> wrote:
>> Depending on the availability of the guest-side drivers, it should be a lot
>> faster to use virtio, both for disk and net.
>>
>> Does anyone know if virtio support ships now in OmniOS? I know there have
>> been some drivers floating around for a while now, but haven't tried them.
>>  -nld
>>
>>
>> On Fri, Sep 13, 2013 at 1:45 PM, ashley willis <ashleywillis76 at gmail.com>
>> wrote:
>>>
>>> I have 14GB dump of a MongoDB database that took 10 minutes to restore
>>> on bare metal OmniOS -- I'm fine with this (system is an 8-core AMD
>>> FX-8150, 32GB ram, pair of 500GB WD 'blue" drives mirrored, 90GB ssd
>>> cache -- all desktop-grade).
>>>
>>> Running OmniOS under KVM on this box, the same operation took 246
>>> minutes with the dump available over an NFS share from the bare metal
>>> system (given 2 cores, 2GB ram, and a 30GB zvol).
>>>
>>> Under the same KVM instance, I decided to see the performance reading
>>> the dump from NFS and having the MongoDB data directory on this same
>>> NFS share, and it's on track to finish in under 60 minutes (half-way
>>> done). That's more than 4 times faster.
>>>
>>> What gives?
>>>
>>> /usr/bin/qemu-system-x86_64 -name OmniOS_Text_r151006p.iso -enable-kvm
>>> -vnc 0.0.0.0:15 -smp 2 -m 2048 -no-hpet -localtime -drive
>>> file=/dev/zvol/rdsk/rpool/omnios,if=ide,index=0 -net
>>> nic,vlan=0,name=net0,model=e1000,macaddr=2:8:20:e:15:33 -net
>>> vnic,vlan=0,name=net0,ifname=vnic10,macaddr=2:8:20:e:15:33 -vga std
>>> -daemonize
>>>
>>> -ashley
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>>
>>