On Wed, 2013-02-27 at 21:17 +0200, Eliezer Tamir wrote: > On 27/02/2013 20:47, Tom Herbert wrote: > > On Wed, Feb 27, 2013 at 10:13 AM, Stephen Hemminger > > <step...@networkplumber.org> wrote: > >> > >> Have you looked at netmap? Seems like a cleaner user API for this. > >> > > That might be a bit orthogonal to this. I believe the intent it to > > allow spin polling from socket calls without API change. > > Exactly. > > BTW, an interesting alternative to netmap would be to map a VF into > userspace. (you would need to pre-allocate DMA memory regions and all of > that RDMA-like stuff)
Unless the hardware has separate event rings for completions, userland is presumably going to need to be able to rewrite the DMA descriptor rings. At which point you have to restrict the VF's DMA with an IOMMU, and might as well let userland allocate and assign DMA buffers dynamically. (In OpenOnload this is called 'scalable buffer mode' as an IOMMU allows mapping more buffers than the on-board buffer table on the SFC9000 family. The catch is that an IOMMU has higher latency.) Ben. -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
