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, 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 system
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 to
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 throughput
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 a
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
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 system.
This adds a barrier call to the basic DMA read/write ops which
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
