On Fri, Oct 14, 2011 at 9:33 AM, Stefan Hajnoczi wrote:
> The next step is trying QEMU's -drive aio=native, which uses Linux AIO
> instead of a custom userspace threadpool for doing I/O. It is usually
> faster. The libvirt domain XML is:
>
>
>
Will do so.
Thanks for your help :D !
> If y
On Thu, Oct 13, 2011 at 4:27 PM, Stefan Hajnoczi wrote:
> dd performs buffered I/O by default. That means it just writes to the
> page cache and the kernel decides when to write out dirty pages.
>
> So your host probably has a bunch more RAM than the guest - dd
> write(2) calls are simply dirtyin
On Thu, Oct 13, 2011 at 1:20 PM, Martin Maurer wrote:
> Host 155
> Guest 120 (raw file on ext3)
>
> Do you run with the virtual disk with cache=no?
Yes i did so (see my previous post)
So i guess there must be something wrong in my setup. or may be i
should use a more recent version of kvm ?
qemu-
M, Michael Tokarev wrote:
> On 13.10.2011 13:05, benoit ROUSSELLE wrote:
>> Hello,
>>
>> Can someone running with virtio tell me if this is normal to have such
>> a difference with dd between host and guest machine ?
>> host dd is 500MB/s
>> guest dd is 150MB/s
&
recent kvm would help ?
On Wed, Oct 12, 2011 at 2:21 PM, benoit ROUSSELLE wrote:
> Dear All,
>
> I am doing some disk io performance testing on the following environment:
> Dell AMD R515 with:
> - debian6 (2.6.32) on host and guests.
> - raid1 mirror on a perc h700
> - lvm u
Dear All,
I am doing some disk io performance testing on the following environment:
Dell AMD R515 with:
- debian6 (2.6.32) on host and guests.
- raid1 mirror on a perc h700
- lvm used to create virtual disks volumes
- virtio enabled per default on 2.6.32 and used for nic and disk drivers
For my t
