Re: [Qemu-discuss] virtual disks perfermonca <=2MB/s

[Jakob Bohm]

On 20/02/2017 17:30, Mimiko wrote:
> On 20.02.2017 17:42, Vincenzo Romano wrote:
> > I think you have to first check your barebones disk I/O throughput.
>
> If you mean running:
>
> time dd if=/dev/zero of=/tmp/test oflag=direct bs=64k count=16000
> 16000+0 records in
> 16000+0 records out
> 1048576000 bytes (1.0 GB) copied, 6.91783 s, 152 MB/s
>
> real    0m6.932s
> user    0m0.016s
> sys     0m0.656s
>
>
> on the host.....
Is /tmp/ the same drive (mount) as /vdisks/ ?

Does anyone know of specific qemu+kvm virtio-blk-pci disk
performance bugs that are large enough to explain this and
were fixed between the (old) qemu version
(1.1.2+dfsg-6+deb7u19) shipped a long time ago in Debian 7
(wheezy) and the current stable qemu?


Enjoy

Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
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