On 10/5/2015 12:41 PM, Venkateswara Rao Dokku wrote: > Thanks for the response Stephen. > > Are you referring to Virt-IO 0.9 in specific here in the response or for > any Virt-IO versions in general? > > On Thu, Oct 1, 2015 at 8:12 PM, Stephen Hemminger < > stephen at networkplumber.org> wrote: > >> On Thu, 1 Oct 2015 09:51:42 +0530 >> Venkateswara Rao Dokku <dvrao.584 at gmail.com> wrote: >> >>> Hi, >>> >>> If we go through the DPDK code it is observed that we are using MMIO for >>> Virt-IO devices. But in the Virt-IO specification, it is written that >> from >>> Virt-IO 1.0 onwards only they are supporting MMIO, all previous versions >>> uses Port IO for RX/TX notifications. >>> >>> So, If I use VirtIO 0.9, Can I get the MMIO based notifications for RX/TX >>> or is it supported only for Virt-IO 1.0 onwards? >>> >> Although the virtio device will bind to the mmio address in some cases, >> it does not use that. It uses i/o port access (see iopl) to activate >> host.
Which is used depends on access time. Check the virtio 1.0 improvement for mmio access. http://events.linuxfoundation.org/sites/events/files/slides/misha2015-v1.pdf Is there any special reason you want to use mmio based notification? > >
