lkml.org 
[lkml]   [2011]   [Jun]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [ANNOUNCE] Native Linux KVM tool v2
On 06/15/2011 03:13 PM, Prasad Joshi wrote:
> On Wed, Jun 15, 2011 at 6:10 PM, Pekka Enberg<penberg@kernel.org> wrote:
>> On Wed, Jun 15, 2011 at 7:30 PM, Avi Kivity<avi@redhat.com> 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


\
 
 \ /
  Last update: 2011-06-15 23:55    [W:0.092 / U:12.836 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site