On 06/15/2011 03:13 PM, Prasad Joshi wrote:
On Wed, Jun 15, 2011 at 6:10 PM, Pekka Enberg<penberg@xxxxxxxxxx> wrote:
On Wed, Jun 15, 2011 at 7:30 PM, Avi Kivity<avi@xxxxxxxxxx> wrote:
On 06/15/2011 06:53 PM, Pekka Enberg wrote:
- Fast QCOW2 image read-write support beating Qemu in fio benchmarks. See
the
following URL for test result details: https://gist.github.com/1026888
This is surprising. How is qemu invoked?
Prasad will have the details. Please note that the above are with Qemu
defaults which doesn't use virtio. The results with virtio are little
better but still in favor of tools/kvm.
The qcow2 image used for testing was copied on to /dev/shm to avoid
the disk delays in performance measurement.
Our experience has been that this is actually not a great way to
simulate fast storage.
Spindle based storage has very different characteristics than memory as
there is a significant cost for seeking.
-hdb uses IDE too. That's pretty unfair since IDE is limited to a
single request at a time whereas virtio can support multiple requests
(and native kvm tools is using virtio).
Regards,
Anthony Liguori
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