On Wed, 16 Feb 2011 16:07:54 +0100, Thomas Broda
wrote:
> I will try Fedora then.
I've installed Fedora 14 on the hypervisor last weekend, and the disk
performance is as bad as it used to be under Centos 5.5.
I think this related to the RAID controller. A Google search for "p400
slow raid5" act
On Wed, 16 Feb 2011 13:11:46 +, Stefan Hajnoczi
wrote:
> A number of performance improvements have been made to KVM and Centos
> 5.5 does not contain them because it is too old. If you want to see a
> more current reflection of KVM performance, you could try Fedora 14
> host and guest.
I w
On Wed, Feb 16, 2011 at 12:50 PM, Thomas Broda wrote:
> On Tue, 15 Feb 2011 15:50:00 +, Stefan Hajnoczi
> wrote:
>
> On Tue, Feb 15, 2011 at 10:15 AM, Thomas Broda
> wrote:
> Using O_DIRECT, performance went down to 11 MB/s on the hypervisor...
>
>
> Hmm...can you restate that as:
>
> host
On Tue, 15 Feb 2011 15:50:00 +, Stefan Hajnoczi
wrote:
On Tue, Feb 15, 2011 at 10:15 AM, Thomas Broda
wrote:
Using O_DIRECT, performance went down to 11 MB/s on the hypervisor...
Hmm...can you restate that as:
host X MB/s
guest Y MB/s
Trying dd with "oflag=direct" an "of=/dev/vg0/lvtes
On Tue, Feb 15, 2011 at 10:15 AM, Thomas Broda wrote:
> On Tue, 15 Feb 2011 09:19:23 +, Stefan Hajnoczi
> wrote:
>
>> Did you run dd with O_DIRECT?
>
>> dd if=/dev/zero of= oflag=direct bs=64k
>
> Using O_DIRECT, performance went down to 11 MB/s on the hypervisor...
Hmm...can you restate tha
On Tue, 15 Feb 2011 09:19:23 +, Stefan Hajnoczi
wrote:
> Did you run dd with O_DIRECT?
> dd if=/dev/zero of= oflag=direct bs=64k
Using O_DIRECT, performance went down to 11 MB/s on the hypervisor...
--
Thomas
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On Mon, Feb 14, 2011 at 6:15 PM, Thomas Broda wrote:
> dd'ing /dev/zero to a testfile gives me a throughput of about 400MB/s when
> done directly on the hypervisor. If I try this from within a virtual guest,
> it's only 19MB/s to 24MB/s if the guest is on the LVM volume (raw device,
> not qcow2 or
Hi,
I've set up a KVM hypervisor for testing purposes. It's running on an
AMD Quad-Core Phenom with a local RAID5 which is made of three disks
connected to a hardware RAID controller. On top of this, there an LVM
volume.
dd'ing /dev/zero to a testfile gives me a throughput of about 400MB/s
