On 05/22/2012 07:03 AM, Michael S. Tsirkin wrote:
On Tue, May 22, 2012 at 09:41:41PM +1000, Benjamin Herrenschmidt wrote:
On Tue, 2012-05-22 at 14:14 +0300, Michael S. Tsirkin wrote:
The baseline is the laptop without kvm talking to the server. The
TCP_STREAM test results are:
It's not a good
On Tue, 2012-05-22 at 15:03 +0300, Michael S. Tsirkin wrote:
> I have a deja vu. Amos sent perf results when you argued about
> exactly the same issue in guest virtio. Delta was small but
> measureable. At the moment I have no free time or free hardware
> to redo the same work all over again. It's
On Tue, May 22, 2012 at 09:41:41PM +1000, Benjamin Herrenschmidt wrote:
> On Tue, 2012-05-22 at 14:14 +0300, Michael S. Tsirkin wrote:
> > > The baseline is the laptop without kvm talking to the server. The
> > > TCP_STREAM test results are:
> >
> > It's not a good test. The thing most affecting t
On Tue, 2012-05-22 at 14:14 +0300, Michael S. Tsirkin wrote:
> > The baseline is the laptop without kvm talking to the server. The
> > TCP_STREAM test results are:
>
> It's not a good test. The thing most affecting throughput results is
> how
> much CPU does you guest get. So as a minumum you need
On Tue, May 22, 2012 at 05:17:39PM +1000, Benjamin Herrenschmidt wrote:
> On Tue, 2012-05-22 at 14:34 +1000, Benjamin Herrenschmidt wrote:
> > The emulated devices can run simultaneously with the guest, so
> > we need to be careful with ordering of load and stores done by
> > them to the guest syst
On Tue, 2012-05-22 at 14:34 +1000, Benjamin Herrenschmidt wrote:
> The emulated devices can run simultaneously with the guest, so
> we need to be careful with ordering of load and stores done by
> them to the guest system memory, which need to be observed in
> the right order by the guest operating
On Tue, 2012-05-22 at 14:34 +1000, Benjamin Herrenschmidt wrote:
> So here's the latest try :-) I've kept is simple, I don't
> add anything to map/unmap at this stage, so we might still
> have a problem with drivers who do that a lot without any
> explicit barrier (ahci ?). My preference is to also
