Hi Konstantin, On Sun, Apr 16, 2017 at 3:26 PM, Ananyev, Konstantin < konstantin.anan...@intel.com> wrote:
> > Hi Ravi, > > > > > Hi, > > > > The reason I am asking I because I have tried different combinations of > > scalar and vector Tx and Rx processing for both IXGBE and I40E with > > following results > > > > 1. Vector Rx and Vector Tx gives best performance but can only support > > packet size of less than or equal to 2048 bytes > > > > 2. Scalar Rx and Scalar Tx works for all packet size but with degraded > > performance > > > > 3. Vector Rx and Scalar Tx (with certain PMD configuration) works fine > > (performance doesn't meet '1') but it has an inherent bug for packet size > > 8192 bytes as PMD stops packet processing > > > > From the code I see both IXGBE and I40E can support scattered vector Rx, > I > > am curious to know any obvious reasons scattered vector Tx support is > left > > out and does it make sense to implement it? > > > > If it makes sense to implement scattered vector Tx and Intel team hasn't > > worked on it I would like to make an attempt at it so kindly let me know. > > > > Yes, right now there is a tradeoff - simple TX functions (both vector and > scalar) are much > faster than full-featured TX function, but don't support any TX offloads > or multi-segs. > If you'd like to provide a patch that would add some TX offloads to the > simple path > without any performance degradation or either a patch that would improve > performance > of full-featured TX function - I am pretty sure such patches would be > welcomed. > Let me work on it and get back to you for any questions for clarifications. Thanks, > Konstantin > > >
